ns for fx: make get_reversed_fusions reuse quantization fusions (#55803)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/55803
Makes the NS `graph_matcher.get_reversed_fusions` use the fusions
defined the FX quantization code instead of duplicating them.
Test Plan:
```
python test/test_quantization.py TestFXNumericSuiteCoreAPIs
python test/test_quantization.py TestFXNumericSuiteCoreAPIsModels
```
Imported from OSS
Reviewed By: jerryzh168
Differential Revision: D27719980
fbshipit-source-id: 12e3183405181bb9001f10e765cfb4d2ffdfdd88
