[quant][graphmode][fx][fp16] Add fp16 support for sigmoid (#52863)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/52863
Test Plan:
python test/test_quantization.py TestQuantizeFxOps.test_fixed_qparams_ops_fp16
Imported from OSS
Reviewed By: vkuzo
Differential Revision: D26672273
fbshipit-source-id: 30d5befe2a24081ac12ac773df4d2bd26d2d0192
