Remove some uses of GrSurface::config()

Bug: skia:6718

Change-Id: I71ad95f910b6434e4d9a01c2750f1b2b08b2f6c4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/233567
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
13 files changed