Revert D27670883: [pytorch][PR] Added an OpInfo for mm & ported its method_tests
Test Plan: revert-hammer
Differential Revision:
D27670883 (https://github.com/pytorch/pytorch/commit/fc1d7a85bba2bc8c484fc57caef3442ea46705bf)
Original commit changeset: 51232f44ab01
fbshipit-source-id: c372b578541626de3871ef94c97b5766c8412580