Merge SkColorSpaceXform_XYZ and SkColorSpaceXform_Pipeline

Use the pipeline implementation to handle F32.

This refactor has been broken away from the following mega-CL.
https://skia-review.googlesource.com/c/6260/

Change-Id: I79d8992f8c4a7e4dbf674a78484057a6b7f4f123
Reviewed-on: https://skia-review.googlesource.com/6585
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Matt Sarett <msarett@google.com>
2 files changed