Revert D28918331: [pytorch][PR] Automated submodule update: FBGEMM
Test Plan: revert-hammer
Differential Revision:
D28918331 (https://github.com/pytorch/pytorch/commit/cc840cf544be560bc76edebff69f5c31cb2f44ae)
Original commit changeset: def60efe5584
fbshipit-source-id: 88101feb87ebfbd38cf10b45d09af309e9759852
