Remove isConfigCopyable from GrCaps.

Bug: skia:6718
Change-Id: I1ad95f838c9d41e5c22811efab5845217880907f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/230894
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
10 files changed