Using this code on A5xx (and probably older too) causes a
smmu bug.

Fixes: 474dadb8 ("drm/msm/a6xx: Add support for using system cache(LLC)")
Signed-off-by: NKonrad Dybcio <konrad.dybcio@somainline.org>
Tested-by: NAngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Reviewed-by: NJordan Crouse <jcrouse@codeaurora.org>
Reviewed-by: NSai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Signed-off-by: NRob Clark <robdclark@chromium.org>