radv: fix emitting depth bias when beginning a command buffer

If depth bias is enabled but zero values used, they were never
emitted to the command buffer because they are equal to the default
values.

Previously, they were always emitted when the bound DS attachment
changed.

This should fix some sort of Z fighting with Dota2 on all GPUs.
This also fixes a different issue (ie. some occlusion queries failures)
on GFX6 because CLEAR_STATE is not used on that chip.

Fixes: 8a47422d ("radv: do not scale the depth bias for D16_UNORM depth surfaces")
Cc: 21.1 mesa-stable
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <!10310>
34 jobs for !10310 with radv_fix_missing_depth_bias_emit in 9 minutes and 56 seconds (queued for 2 seconds)
latest detached
Status Job ID Name Coverage
  Sanity
passed sanity #9029994

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  Container
passed arm_build #9030001
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passed windows_build_vs2019 #9030003
windows shell 1809 mesa

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passed x86_test-base #9029999

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  Container 2
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passed kernel+rootfs_amd64 #9030020

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passed kernel+rootfs_armhf #9030024
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passed ppc64el_build #9030011

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passed s390x_build #9030013

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passed x86_build #9030007

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passed x86_test-gl #9030016

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passed x86_test-vk #9030018

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  Meson X86 64
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passed meson-gallium #9030033

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passed meson-release #9030035

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passed meson-testing #9030027

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passed meson-testing-asan #9030029

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passed meson-vulkan #9030040

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  Build Misc
passed arm_test #9030043

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passed meson-android #9030045

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passed meson-arm64 #9030047
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passed meson-arm64-asan #9030049
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passed meson-arm64-build-test #9030052
aarch64

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passed meson-armhf #9030046
aarch64

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passed meson-i386 #9030054

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passed meson-mingw32-x86_64 #9030060

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passed meson-ppc64el #9030058

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passed meson-s390x #9030056
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  Amd
passed radv-fossils #9030062

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