Adds support for bgra10xr loading. Bug: skia: https://github.com/flutter/flutter/issues/148851 Change-Id: I79cbd7043638a0cb455c2477baabbcb4895a0a5d Reviewed-on: https://skia-review.googlesource.com/c/skcms/+/861638 Reviewed-by: Brian Osman <brianosman@google.com> Commit-Queue: Aaron Clarke <aaclarke@google.com>