make 1010102/888x layers 8888, not 1010102/888x

This hopefully keeps all other considerations the same,
like sRGB keeps sRGB layers, F16 F16 layers, etc.

Change-Id: Icdf0b259ae782321e6f96c6f8bc814d520c7dd25
Reviewed-on: https://skia-review.googlesource.com/110442
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed