freedreno/a6xx: Disable sample averaging on depth/stencil resolves.

From the GLES 3.2 spec:

"If the source formats are integer types or stencil values, a single
sample’s value is selected for each pixel. If the source formats are
floating-point or normalized types, the sample values for each pixel are
resolved in an implementation-dependent manner. If the source formats are
depth values, sample values are resolved in an implementation-dependent
manner where the result will be between the minimum and maximum depth
values in the pixel."

For Z24S8 we were doing an average, which would be invalid for the stencil
data, and apparently the CTS didn't catch that.  For Z32F, our averaging
was technically legal, but given the Vulkan spec's requirement of sample 0
support but not sample average support for depth and stencil resolves, it
suggests that our averaging behavior was unusual.  Let's not spend power
on producing surprising results.

Part-of: <!9661>
60 jobs for !9661 with fd-sample-resolve in 22 minutes and 42 seconds (queued for 3 seconds)
latest detached
Status Job ID Name Coverage
  Sanity
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sanity

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  Container
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aarch64
arm_build

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arm_test-base

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windows shell 1809 mesa
windows_build_vs2019

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x86_build-base

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x86_test-base

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  Container 2
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android_build

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arm64_test

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armhf_test

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i386_build

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kernel+rootfs_amd64

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aarch64
kernel+rootfs_arm64

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aarch64
kernel+rootfs_armhf

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ppc64el_build

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s390x_build

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x86_build

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x86_test-gl

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x86_test-vk

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  Meson X86 64
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meson-clang

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meson-clover

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meson-clover-testing

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meson-gallium

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meson-release

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meson-testing

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meson-testing-asan

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meson-vulkan

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  Build Misc
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meson-android

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aarch64
meson-arm64

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aarch64
meson-arm64-asan

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aarch64
meson-arm64-build-test

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aarch64
meson-armhf

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meson-i386

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meson-mingw32-x86_64

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kvm
meson-ppc64el

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kvm
meson-s390x

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google-freedreno-db410c
a306_gles2

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google-freedreno-db410c
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google-freedreno-db410c
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google-freedreno-db410c
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google-freedreno-db410c
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google-freedreno-db820c
a530_gles2

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google-freedreno-db820c
a530_gles31 1/2

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google-freedreno-db820c
a530_gles3 1/2

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google-freedreno-db820c
a530_gles31 2/2

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google-freedreno-db820c
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passed #8209265
google-freedreno-db820c
a530_piglit_gl

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passed #8208314
google-freedreno-db820c
a530_piglit_shader

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google-freedreno-cheza
a630_gl

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google-freedreno-cheza
a630_gles2

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passed #8208320
google-freedreno-cheza
a630_gles3

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google-freedreno-cheza
a630_gles31

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google-freedreno-cheza
a630_gles_asan

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google-freedreno-cheza
a630_gles_others

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google-freedreno-cheza
a630_piglit_gl

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google-freedreno-cheza
a630_piglit_shader

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google-freedreno-cheza
a630-traces

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google-freedreno-cheza
a630_vk 1/2

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google-freedreno-cheza
a630_vk 2/2

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google-freedreno-cheza
a630_vk_sysmem

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failed #8208312
google-freedreno-db820c
a530_piglit_gl

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