Revert "Pass colorspace-transform coefficients in a 4x4 matrix."

This reverts commit b16b8d4d487b6d7b82848180b05496c1115f389f.

Reason for revert: breakage on tree

Original change's description:
> Pass colorspace-transform coefficients in a 4x4 matrix.
>
> Previously, these were passed as arrays of 7 scalars. In std140
> layout, this wastes a lot of uniform space, as we burn 12 padding
> bytes between each array element. Passing as a 4x4 matrix is
> convenient and only wastes two matrix elements total (since we need
> fourteen elements, and actually get sixteen).
>
> Change-Id: Ibc204519628f59145f013f1c6fa038c92088969d
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/748301
> Commit-Queue: Robert Phillips <robertphillips@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>
> Commit-Queue: John Stiles <johnstiles@google.com>
> Auto-Submit: John Stiles <johnstiles@google.com>

Change-Id: I228b80aa9422e56b760b0f57d211cb38044b0e23
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/748305
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
5 files changed