Revert "Add BGR_10A2 support to Ganesh"

This reverts commit 44fc53b7f5d8390d7ae228d5fa8bac0b225ed2b9.

Reason for revert: Test to see if this is causing the linux-rel MediaColorTest.Yuv420pHighBitDepth failure on the Chrome roll

Original change's description:
> Add BGR_10A2 support to Ganesh
> 
> Bug: 1068416
> Change-Id: I40aa84b7f3f770ba550b7bea44c10173ae9a7ddf
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/285356
> Reviewed-by: Greg Daniel <egdaniel@google.com>
> Reviewed-by: Jim Van Verth <jvanverth@google.com>
> Commit-Queue: Robert Phillips <robertphillips@google.com>

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

Change-Id: I0ad0197ebd8de9b8761f84ba808c9f90891b9238
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1068416
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/285958
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
20 files changed