Remove 4 files from include/private/gpu/ganesh

These are no longer used from include/ so can be safely moved under src.

Change-Id: Ia4b6dbc508f9e09d3826159a389b9cedf619edab
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/765319
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
30 files changed