radv: Support DCC modifiers fully.

Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <!9998>
35 jobs for master
Status Name Job ID Coverage
  Container
manual arm_build #8684624
aarch64 manual
manual windows_build_vs2019 #8684625
windows shell 1809 mesa manual
manual x86_build-base #8684622
manual
manual x86_test-base #8684623
manual
 
  Container 2
created android_build #8684633
created i386_build #8684630
created kernel+rootfs_amd64 #8684626
created kernel+rootfs_arm64 #8684627
aarch64
created kernel+rootfs_arm64-baremetal #8684636
aarch64
created kernel+rootfs_armhf #8684628
aarch64
created kernel+rootfs_armhf-baremetal #8684637
aarch64
created ppc64el_build #8684631
created s390x_build #8684632
created x86_build #8684629
created x86_test-gl #8684634
created x86_test-vk #8684635
 
  Meson X86 64
created meson-clang #8684643
created meson-clover #8684644
created meson-clover-testing #8684640
created meson-gallium #8684641
created meson-release #8684642
created meson-testing #8684638
created meson-testing-asan #8684639
created meson-vulkan #8684645
 
  Build Misc
created arm_test #8684646
created meson-android #8684647
created meson-arm64 #8684649
aarch64
created meson-arm64-asan #8684650
aarch64
created meson-arm64-build-test #8684651
aarch64
created meson-armhf #8684648
aarch64
created meson-i386 #8684652
created meson-mingw32-x86_64 #8684655
created meson-ppc64el #8684654
kvm
created meson-s390x #8684653
kvm
 
  Amd
created radv-fossils #8684656