Fix tile period of subsampled planes in YUVA images

Bug: chromium:1210557
Change-Id: Ib41cbf3236abdbb105ce818756505ff40c868cf1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/411301
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
2 files changed