Revert "quantize avx: copy 32x32 implementation"

Revert "quantize avx: copy 32x32 implementation"

This reverts commit f60d1dcd3de46f72bafc5eeef481bd1a4e203301.

Reason for revert: <INSERT REASONING HERE>
Failures in AVX/VP9QuantizeTest in nightly tests.
Original change's description:
> quantize avx: copy 32x32 implementation
>
> Ensure avx and ssse3 stay in sync by testing them against each other.
>
> Change-Id: I699f3b48785c83260825402d7826231f475f697c

TBR=slavarnway@google.com,johannkoenig@google.com,builds@webmproject.org

Change-Id: Ibd38636212269328317dd0721be9d25452113d1c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true