Revert D25445815: [te] Add fast log approximation based on sleef
Test Plan: revert-hammer
Differential Revision:
D25445815 (https://github.com/pytorch/pytorch/commit/1329066b694a7a552352920b4775eaadeee1313e)
Original commit changeset: 20696eacd12a
fbshipit-source-id: 38830a6abd16260d60e5dd9a5594e65736a9c782
