Add torch.nn.quantized.functional namespace (#20042)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20042
Exposing torch.ops.quantized as torch.nn.quantized.functional
Differential Revision: D15178099
fbshipit-source-id: 8d65134bd727296f2750bbd2b54df0b99fc84b33
