Revert "Add AVX-512 detection to SkCpu"

This reverts commit 3c322e23a013e78fcbe0edd7adccd580af8466bc.

Reason for revert: crash in SkCpu on Mac

Original change's description:
> Add AVX-512 detection to SkCpu
> 
> I've added a SKY alias for the five new bits detected on a Skylake Xeon.
> 
> Change-Id: I9f7dd48f4dc866608d81befd061434ca325ef451
> Reviewed-on: https://skia-review.googlesource.com/9043
> Reviewed-by: Herb Derby <herb@google.com>
> Commit-Queue: Mike Klein <mtklein@chromium.org>
> 

TBR=mtklein@chromium.org,herb@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I3cc06c7e32391e68d6cfe084786b18270cdab631
Reviewed-on: https://skia-review.googlesource.com/9074
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Cary Clark <caryclark@google.com>
2 files changed