minigbm/msm: Enable UBWC for NV12 buffers

minigbm/msm: Enable UBWC for NV12 buffers

BUG=b:149525848
TEST=video_decode_accelerator_tests use UBWC

Change-Id: I66f44f31f69b2a1d32c66a802c21e0a76d95ec89
Cq-Depend: chromium:2460816, chromium:2455450
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/2343729
Tested-by: Kristian H. Kristensen <hoegsberg@chromium.org>
Reviewed-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Fritz Koenig <frkoenig@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@chromium.org>
Commit-Queue: Kristian H. Kristensen <hoegsberg@chromium.org>