Move Software and Small PathRenderers to skgpu::v1 namespace

Bug: skia:11837
Change-Id: Ia34f1840aaa7360ea9a3ca40fef5cb96b68c6ca3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/439781
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
10 files changed