Revert "Stop conflating F16 with linear gamma"

This reverts commit d1589c7213d4a23c7c5c352f70d753eb7f07518d.

Reason for revert: Depends on skcms CL that's been reverted.

Original change's description:
> Stop conflating F16 with linear gamma
> 
> Note to self: I debugged this, realized that the codecs
> need to handle A2B -> XYZ, then realized that I just need
> to wait for https://skia-review.googlesource.com/c/skia/+/136062
> 
> Bug: skia:
> Change-Id: I594c22076feb3700b8a40c471a541fef5ff4e13e
> Reviewed-on: https://skia-review.googlesource.com/137587
> Commit-Queue: Brian Osman <brianosman@google.com>
> Reviewed-by: Mike Klein <mtklein@google.com>

TBR=mtklein@google.com,brianosman@google.com

Change-Id: I6dca583697c8efd2563d30cb7ab9ef505b6903ae
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/148860
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
8 files changed