[quant][graphmode][fx] Produce reference linear module in convert (#60152)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/60152
Test Plan:
python test/test_quantization.py TestQuantizeFx
Imported from OSS
Reviewed By: vkuzo
Differential Revision: D29188263
fbshipit-source-id: f7bbbef5d4d747eadf7a627a4e77a5ec9bb0bc94
