Add quantized::softmax to fc list
Hoping to fix regression from https://hud.pytorch.org/minihud#1bcae0d10e1c4eddf07f9e60ced9b4f3c2c04b1f
Adding quantized::softmax to list until 4/15/22.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/75254
Approved by: https://github.com/albanD
