[metal] Enable all formats supportable on M1 Mac

Change-Id: Ida4c283e2319509feffdc53fd4fcec375ad00b61
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/584922
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
4 files changed