[iOS][Metal] Add aten:hardswish (#64588)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64588
Add `aten::hardswish` to run the mobilenetv3 model from torchvision.
ghstack-source-id: 137479323
Test Plan:
- buck test pp-macos
- circleCI
Reviewed By: beback4u
Differential Revision: D30781008
fbshipit-source-id: 83454869195ef4ab50570ea9b3bf2a55f32a3e86
