Revert D28114231: [pytorch][PR] Automated submodule update: FBGEMM
Test Plan: revert-hammer
Differential Revision:
D28114231 (https://github.com/pytorch/pytorch/commit/264db1959e8c93387bdd1f396412ebf5bd59976f)
Original commit changeset: 0a5883ebb2fc
fbshipit-source-id: edcb0d2ae1adfdea0999a6e410bdbe530bf61dda
