[Graphite] Make SkCapabilities be a member of graphite::Caps instead of base class.

Bug: b/239822490
Change-Id: Ib28a7ad47493757bb6f4ebaddc780e5052d6cb3b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/567440
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Auto-Submit: Greg Daniel <egdaniel@google.com>
4 files changed