freedreno/a6xx: Sysmem clear fixes
What does this MR do and why?
freedreno/a6xx: Sysmem clear fixes
Handled signed/unsigned channel clamping.
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11676
Signed-off-by: Rob Clark <robdclark@chromium.org>
Edited by Rob Clark