Revert D30199482: [pytorch][PR] Add BFloat16 support for unique and unique_consecutive on CPU
Test Plan: revert-hammer
Differential Revision:
D30199482 (https://github.com/pytorch/pytorch/commit/fc0b8e60337ae46b90ed5d2f6d1f623f0f8d6581)
Original commit changeset: 6f2d9cc1a528
fbshipit-source-id: 39e9f202bcbd978525f792173d4f97b5b329b5b1
