This pulls in the changes that Firefox made to add BT.2020 support as well
as expands them to the existing 10-bit support. So we now have the following
input formats: U420, U422, U444, U010.

BUG=960620, libyuv:845

Change-Id: If0c47853a465d0ed660f849db08e71489fe1b9c2
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/1884468
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Frank Barchard <fbarchard@chromium.org>