freedreno/a6xx: refactor debug logging

Break it out into a helper fxn, and cleanup the copy/pasta.  Also, add
something so we can tell when src and/or dst are UBWC.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6434>
1 file changed