minigbm: i915: align YV12 to HW requirements

As per drm_gralloc we need to:

 (1) align the Y plane to 128 bytes so the chroma planes would be
     aligned to 64 bytes boundaries.
 (2) Have no tiling with YV12.

BUG=chromium:616275
TEST=DecodeEditEncodeTest#testVideoEdit720p

passes on cyan. Run YT app.

Change-Id: I339163c94d4481991702b8bfd232a70f3a275506
Reviewed-on: https://chromium-review.googlesource.com/456403
Commit-Ready: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
1 file changed