Added missed ETC2 case to GrVkFormatColorTypePairIsValid

Bug: skia: none
Change-Id: Ie4613a018db42040cc2450b25f14007e3199cff6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/243098
Commit-Queue: Robert Phillips <robertphillips@google.com>
Auto-Submit: Vasiliy Telezhnikov <vasilyt@chromium.org>
Reviewed-by: Robert Phillips <robertphillips@google.com>
1 file changed