Some more clean-up of YUVA code

* Restore pre-colortype interface
* Remove other colortype references

Bug: skia:7903
Change-Id: I0db6d61e78d719ff941ac195bcbed4416f7d3138
Reviewed-on: https://skia-review.googlesource.com/c/164610
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
7 files changed