[reland][quant][fix] Remove activation_post_process in qat modules (#42343) (#43015)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43015
Currently activation_post_process are inserted by default in qat modules, which is not
friendly to automatic quantization tools, this PR removes them.
Test Plan:
Imported from OSS
Imported from OSS
Reviewed By: vkuzo
Differential Revision: D23105059
fbshipit-source-id: 3439ac39e718ffb0390468163bcbffd384802b57
