Add native impl of gelu for QuantizedCPU (#69968)
Summary:
Add native implementation of gelu for quantized CPU.
cc jerryzh168 jianyuh raghuramank100 jamesr66a vkuzo
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69968
Reviewed By: ejguan
Differential Revision: D33187095
Pulled By: vkuzo
fbshipit-source-id: 4c4bf0eb47d2d9c2b8827174f2ccdea41986148a
