Add missing 16 alignment constraint of chroma stride for YV12

Exynos encoder need 16 stride alignment for both luma and chroma
in YV12. Add 32 stride alignment for luma to ensure we meet the
requirement. This change will not impact the decoding case since
we use 64 stride alignment by default.

Bug: 201012738
Test: run vts -m VtsHalMediaC2V1_0TargetVideoEncTest
Change-Id: I7086366bfaf4f589e878c732b30b615034ccfa20
(cherry picked from commit a48bf1aa7ec589878545d291b2b44110b54076db)
1 file changed