ns for fx: remove deprecated code (#56195)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/56195
This is outdated, removing (forgot to clean up in a previous PR).
Test Plan:
```
python test/test_quantization.py TestFXGraphMatcher
```
Imported from OSS
Reviewed By: jerryzh168
Differential Revision: D27805334
fbshipit-source-id: 3b035945b4928a3c727e96e0f7fe0efe201f42c0
