gralloc: Add vstride to gralloc handles, pad rgb surfaces

If rgb surfaces are padded to nearest 16 pixels in height,
the gscalar can accept them.  This change increases the number
of cases where the hardware composer can make use of the
gscalar.

Change-Id: Iffacbdb2637c8b80c5cd0a8a62d015e854950a43
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
2 files changed