Revert D25564477: [pytorch][PR] Add sinc operator
Test Plan: revert-hammer
Differential Revision:
D25564477 (https://github.com/pytorch/pytorch/commit/bbc71435b7bbaee310f488be766b1a37bb9a08ca)
Original commit changeset: 13f36a2b84da
fbshipit-source-id: 58cbe8109efaf499dd017531878b9fbbb27976bc
