Add some missed BGRA_1010102 testing tidbits

A follow up to:
https://skia-review.googlesource.com/c/skia/+/285356 (Add BGR_10A2 support to Ganesh)

Change-Id: If19e234bf80d4affd515d6168f1faeec13f4fcf8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/285856
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2 files changed