Prior to 4dcf32c56e, radv was getting a request for implicit sync, even
when we were doing the work to do implicit sync in the WSI. Once that was
turned off, we incidentally dropped flagging WSI's mem->buffer as
uncached, due to it being under the wrong condition.
Fixes: 4dcf32c56e ("wsi/drm: Don't request implicit sync if we're doing implicit sync ourselves.")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37772>
Emma Anholt
38ac55ebff