mediatek: Align height to 16 bytes for NV12

mediatek: Align height to 16 bytes for NV12

We want to use the same buffer from camera to JPEG hardware encoder so
align the height of camera usage buffer 16 that is required by the JPEG
hardware encoder.

BUG=b:141516308
TEST=Check if data offset is correct. Take picture with CCA.

Change-Id: I0db10762494423f7c4a340725015839803b40af4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/1984211
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Hsu Wei-Cheng <mojahsu@chromium.org>
Commit-Queue: Hsu Wei-Cheng <mojahsu@chromium.org>