Revert "low-hanging bilerp_clamp_8888 wins"

This reverts commit f946b41643e049f3b81f40316373ad22e1518818.

Reason for revert: nervous diffs

Original change's description:
> low-hanging bilerp_clamp_8888 wins
> 
>    - support sampling bgra too
>    - lowp impl
> 
> Bug: skia:7810
> 
> Change-Id: I21db805483f612024802f2b508c140c42a029c54
> Reviewed-on: https://skia-review.googlesource.com/121582
> Commit-Queue: Mike Klein <mtklein@google.com>
> Reviewed-by: Florin Malita <fmalita@chromium.org>

TBR=mtklein@chromium.org,mtklein@google.com,fmalita@chromium.org

Change-Id: Id91d583151091a082a2d3f301d85f3acb12f4b19
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:7810
Reviewed-on: https://skia-review.googlesource.com/121589
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
2 files changed