radeonsi: reduce overhead for resident textures which need color decompression

radeonsi: reduce overhead for resident textures which need color decompression

This is done by introducing a separate list.

si_decompress_textures() is now 5x faster.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>