[quant][fx] Support override observers and fake quantize module in backend_config_dict (#75135)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/75135
Some operators have fixed quantization parameters, this PR adds the support to override the
qconfig in the backend_config_dict
Test Plan:
python test/test_quantization.py TestQuantizeFx
python test/test_quantization.py TestQuantizeFxOps
Imported from OSS
Reviewed By: vkuzo
Differential Revision: D35334279
fbshipit-source-id: 390510bd8fc2d61004c36c54390989583e6519ce
(cherry picked from commit ccf9bcd7eb4564ec97c5e0548b8ee926f640360b)
