radv: fix DCC decompress on GFX11

The hardware requires one color output to be set by CB registers,
otherwise the DCC decompression does nothing.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/8127
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/8175
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/8370
Cc: mesa-stable
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21629>
(cherry picked from commit 4ec6850210d1a8ff2549df7800f414bc9b604edb)
2 files changed