v3d: DRM_FORMAT_MOD_BROADCOM_SAND128 only available for NV12 format.

We were exposing as available DRM_FORMAT_MOD_BROADCOM_SAND128 for
any format.

Fixes: 95c4f0f9 "v3d: Enables DRM_FORMAT_MOD_BROADCOM_SAND128 support"
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Part-of: <!10524>
39 jobs for master
Status Job ID Name Coverage
  Container
manual arm_build #9326650
aarch64 manual
manual windows_build_vs2019 #9326651
windows shell 1809 mesa manual
manual x86_build-base #9326648
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manual x86_test-base #9326649
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created meson-testing-asan #9326663
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created arm_test #9326670
created meson-android #9326671
created meson-arm64 #9326673
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created meson-arm64-build-test #9326675
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created meson-armhf #9326672
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created meson-i386 #9326676
created meson-mingw32-x86_64 #9326679
created meson-ppc64el #9326678
created meson-s390x #9326677
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created v3d-rpi4-gles2:armhf #9326686
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created v3d-rpi4-gles31:armhf 1/2 #9326680
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created v3d-rpi4-gles3:armhf 3/4 #9326684
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created v3d-rpi4-gles3:armhf 4/4 #9326685
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