Back out "Revert D25375885: [pytorch][PR] Reenable some BF16 tests on CUDA"
Summary: Revert D25397144 69829f3fff4d4a2d1a71bb52e90d3c7f16b27fa3
Test Plan: Revert Hammer
Reviewed By: janeyx99
Differential Revision: D25397572
fbshipit-source-id: 625ca2a32e4558ae4582a15697b6e1cc57cc1573
