qat eager: remove unneeded modules (#40396)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/40396
Removes activation and normalization modules from eager mode QAT.
These were incorrectly added, but we don't actually need them.
Test Plan:
```
python test/test_quantization.py TestQuantizationAwareTraining
```
Imported from OSS
Differential Revision: D22169768
fbshipit-source-id: b5bd753dafe92e90e226fb773eb18c6aae179703
