Codec2Buffer: vstride to match height

Make sure vstride matches height from the format to
accommodate apps with this assumption.

Bug: 198104271
Test: cts/media/device-small
Signed-off-by: Vinay Kalia <vinaykalia@google.com>
Change-Id: I27db6483e74c0981a76f9c7dcd208ef9b31ad947
(cherry picked from commit d8c48101)