Rename skgpu::v1 -> skgpu::ganesh in some Ganesh ops

This is mainly to get a feel for what this conversion is going to be like.

The two converted ops are:
  AtlasTextOp
  TextureOp

Change-Id: I42f24b5661d4bd871334f9acde3bbfa9cfca2d70
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/585972
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
12 files changed