Revert D22217029: Add fake quantize operator that works in backward pass
Test Plan: revert-hammer
Differential Revision:
D22217029 (https://github.com/pytorch/pytorch/commit/48e978ba181b6c2b54a371733f86b600f6983d37)
Original commit changeset: 7055a2cdafcf
fbshipit-source-id: f57a27be412c6fbfd5a5b07a26f758ac36be3b67
