radeonsi: add a fast path for MSAA resolving with RGB -> BGR swizzling

radeonsi: add a fast path for MSAA resolving with RGB -> BGR swizzling

When we encounter a situation when we need to swizzle, which the CB can't
resolve in one pass, swap the channel order on the next clear, so that we
don't have to swizzle.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9615>