Remove virtual SkImage_Base::getPlanes

Change-Id: I5b106455cc54dad600e64b3f1bfcd02f5099b75b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/306360
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Adlai Holler <adlai@google.com>
10 files changed