Revert D32010095: [pytorch][PR] Add ability for a mobile::Module to save as flatbuffer
Test Plan: revert-hammer
Differential Revision:
D32010095 (https://github.com/pytorch/pytorch/commit/41d35dc2014e030bd67d97be3e4e6cb62cb16aef)
Original commit changeset: d763b0557780
fbshipit-source-id: bf746a0389135c9f5f67f00f449435ce08fb5f6d
