Revert D23385091: [quant][graphmode][fx] Add top level APIs
Test Plan: revert-hammer
Differential Revision:
D23385091 (https://github.com/pytorch/pytorch/commit/eb4199b0a72bd390780fef5291f72cf213646ff9)
Original commit changeset: b789e54e1a0f
fbshipit-source-id: dc3dd9169d34beab92488d78d42d7e7d05e771d1
