Revert "Reland: Add ISO 21496-1 gainmap parsing"

This reverts commit a9ba7411d4b22a333b3e1eca8436f6da53f59406.

Reason for revert: Causes failures on ASAN test jobs (see for example https://chromium-swarm.appspot.com/task?id=69942da88ae5cd10)

Original change's description:
> Reland: Add ISO 21496-1 gainmap parsing
>
> To SkGainmapInfo, add the functions ParseVersion, Parse,
> SerializeVersion, and serialize. These generate the ISO 21496-1
> binary blobs.
>
> Reverted because of unused function in test. Moved function inside
> appropriate ifdef.
>
> Bug: b/338342146
> Change-Id: I98436f3757f08668c3129b02f40dd5bbe223a073
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/853216
> Reviewed-by: Brian Osman <brianosman@google.com>
> Reviewed-by: Christopher Cameron <ccameron@google.com>
> Commit-Queue: Christopher Cameron <ccameron@google.com>

Bug: b/338342146
Change-Id: Ia5d42fa6449271b11f92ef90fcb2351c151b6175
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/853319
Auto-Submit: Arman Uguray <armansito@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
6 files changed