Revert D23913105: [quant][graphmode][fx] Merge all quantization mode
Test Plan: revert-hammer
Differential Revision:
D23913105 (https://github.com/pytorch/pytorch/commit/ffcb0989e76798ddb893b9e156ae1113d2498bb5)
Original commit changeset: 4e335286d6de
fbshipit-source-id: 5765b4e8ec917423f1745f73a9f3f235fc53423d
