Move GrQuad to src/gpu/geometry folder

Change-Id: I3d1b8e8268c2cd0d1ceec93c847069494b9aa965
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/216601
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
14 files changed