radv: resolve all layers in compute resolve path.

radv: resolve all layers in compute resolve path.

This path should iterate across all layers, I've some ideas
for doing this in a single pass, but this is simpler for now.

This passes the tests because we don't use the fragment path
unless we have DCC, and we don't have DCC on layered images.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Cc: <mesa-stable@lists.freedesktop.org>