Revert "[graphite] Add instanced geometry for text."

This reverts commit faf97e5d2c2b879cb64db6da8599262b7674b807.

Reason for revert: Significant perf regression

Original change's description:
> [graphite] Add instanced geometry for text.
>
> Bug: skia:13118
> Change-Id: Ifb738ffdefe489b08bfccedffa3d71c59818444c
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/562761
> Reviewed-by: Michael Ludwig <michaelludwig@google.com>
> Commit-Queue: Jim Van Verth <jvanverth@google.com>

Bug: skia:13118
Change-Id: Ie9bc50f0bab79c3345a4ddf7c346343d6b51cb26
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/567436
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Jim Van Verth <jvanverth@google.com>
5 files changed