[static runtime] Generate sigmoid with NNC (#52424)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/52424
NNC has a fast sigmoid on par with aten. Using it for static runtime
lets us skip dispatch overhead.
ghstack-source-id: 121953787
Test Plan:
```
caffe2=0 batch=1 run.sh
```
Reviewed By: bwasti
Differential Revision: D26291425
fbshipit-source-id: a2ad79765dacee352625f0e5322e871556e0ca9e
