radv/gfx9: handle GFX9 opaque metadata
port the opaque metadata changes from radeonsi for gfx9. Reviewed-by:Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl> Cc: "17.2" <mesa-stable@lists.freedesktop.org> Signed-off-by:
Dave Airlie <airlied@redhat.com> (cherry picked from commit e43cc3e3)