[graphite] Update some GMs to use Graphite's makeSubset call

These changes don't actually improve any GM images since the new makeSubset API is still stubbed out.

Bug: b/237111152
Change-Id: I80ae81279a3ebfc798641f7e6062d882924908b9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/629917
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: James Godfrey-Kittle <jamesgk@google.com>
4 files changed