[graphite] Don't run GMs that test automatic image tiling

Change-Id: I207e8fa1c98e9b963c5e36b4d9e6d592bf2515f8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/890156
Commit-Queue: James Godfrey-Kittle <jamesgk@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
3 files changed