Remove rgf32 stages from RP

These didn't correspond to a real SkColorType, and were only used for
tests.

Change-Id: I3fa6dafb9e5ce24805a099a7e1ffa1a097d7bcdd
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/775401
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
3 files changed