Revert D23385090: [quant][graphmode][fx] Add support for weight prepack folding
Test Plan: revert-hammer
Differential Revision:
D23385090 (https://github.com/pytorch/pytorch/commit/ef08f92076806b9f17290876db7c5ea87c09873c)
Original commit changeset: 11341f0af525
fbshipit-source-id: fe2bcdc16106923a2cee99eb5cc0a1e9c14ad2c5
