radv: fix various CMASK regressions on GFX9

This fixes a bunch of MSAA related CTS regressions. This restores
previous behaviour on GFX9 but it should be fixed properly.

Cc: 21.1 mesa-stable
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <!10374>
34 jobs for !10374 with radv_fix_cmask_regressions_gfx9 in 11 minutes and 19 seconds (queued for 3 seconds)
latest detached
Status Job ID Name Coverage
  Sanity
passed sanity #9231238

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  Container
passed arm_build #9231244
aarch64

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passed windows_build_vs2019 #9231246
windows shell 1809 mesa

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passed x86_build-base #9231240

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passed x86_test-base #9231242

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  Container 2
passed android_build #9231256

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passed i386_build #9231250

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passed kernel+rootfs_amd64 #9231261

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passed kernel+rootfs_arm64 #9231263
aarch64

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passed kernel+rootfs_armhf #9231265
aarch64

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passed ppc64el_build #9231252

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passed s390x_build #9231254

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passed x86_build #9231249

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passed x86_test-gl #9231257

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passed x86_test-vk #9231259

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  Meson X86 64
passed meson-clang #9231275

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passed meson-clover #9231277

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passed meson-clover-testing #9231270

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passed meson-gallium #9231272

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passed meson-release #9231274

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passed meson-testing #9231267

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passed meson-testing-asan #9231268

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passed meson-vulkan #9231279

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  Build Misc
passed arm_test #9231281

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passed meson-android #9231282

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passed meson-arm64 #9231286
aarch64

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passed meson-arm64-asan #9231288
aarch64

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passed meson-arm64-build-test #9231290
aarch64

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passed meson-armhf #9231284
aarch64

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passed meson-i386 #9231292

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passed meson-mingw32-x86_64 #9231297

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passed meson-ppc64el #9231295

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passed meson-s390x #9231293
kvm

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  Amd
passed radv-fossils #9231299

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