Revert "radv: add support for MRTs compaction to avoid holes"

Revert "radv: add support for MRTs compaction to avoid holes"

This reverts commit 7a5e6fd25f2e132ef4cacc3a5b714c4e153227b0.

Since we have two different users bisecting issues to this commit, let's
revert.

Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Fixes: 7a5e6fd25f2 "radv: add support for MRTs compaction to avoid holes"
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3202
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3228
(Other report in https://gitlab.freedesktop.org/mesa/mesa/-/issues/3151#note_558589)

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5758>