Revert "Remove some uses of GrBytesPerPixel"

This reverts commit 13f02be29175e2958af80efd0c3a253763907e06.

Reason for revert: Vulkan assert

Original change's description:
> Remove some uses of GrBytesPerPixel
> 
> GrPixelConfig needs to go away. Towards that end, switch the Vk and GL backends over to using their native formats.
> 
> Change-Id: I92c80eb27e5d639097a40745429721208fe26836
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/213428
> Reviewed-by: Greg Daniel <egdaniel@google.com>
> Commit-Queue: Robert Phillips <robertphillips@google.com>

TBR=egdaniel@google.com,robertphillips@google.com

Change-Id: I253b6587a33c9195266772386aace1c53e0652cf
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/213468
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
7 files changed