Revert "change matrix_2x3 to row-major"

This reverts commit e023608611b69a7c20682846d4701d3133168cf0.

Reason for revert: breaking asserts

Original change's description:
> change matrix_2x3 to row-major
>
> Change-Id: Id25b3875f54f359bac90b6d3a7695287fc108b64
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/456467
> Reviewed-by: Brian Osman <brianosman@google.com>
> Commit-Queue: Herb Derby <herb@google.com>

Change-Id: I26148f2a6a614ba013cc850bbb9ad7b488c50f6b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/456636
Auto-Submit: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
4 files changed