radv: Add WSI buffers to BO list only if they can be used.

radv: Add WSI buffers to BO list only if they can be used.

Also reverse the BO list removal loop. This way typical WSI usage
should find the entry in O(active swapchains) iterations, which
should not be a performance issues. Tested with Doom(2106) which
found the entry in 1 iteration every time.

Acked-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4306>