Revert "Some more clean-up of YUVA code"

This reverts commit c96740729a6a524ec4c768af84b876dcac1dbd7f.

Reason for revert: looks like this broke a bunch of layout tests on the Chrome roll.

Original change's description:
> 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>

TBR=jvanverth@google.com,bsalomon@google.com

Change-Id: Ic04955ad526774080dad79852a974b1b3743dfe0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:7903
Reviewed-on: https://skia-review.googlesource.com/c/164683
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
7 files changed