Revert D32175963: Converting hardswish to strucutred kernels with metatensor support
Test Plan: revert-hammer
Differential Revision:
D32175963 (https://github.com/pytorch/pytorch/commit/57335a9ee3f3a6a34ddb11e924be9c33abc04abb)
Original commit changeset: f4d749c6aeaf
fbshipit-source-id: 6d68a96cf872c2d7b518c061875b9336bca0043a
