dbr quant: start reusing static quant module mappings (#70196)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70196
Deletes the custom DBR static quant module mapping, and reuses
the global ones.
Test coverage for all the ops will be in future PRs.
Test Plan:
```
python test/test_quantization.py TestQuantizeDBR
```
Reviewed By: jerryzh168
Differential Revision: D33240998
Pulled By: vkuzo
fbshipit-source-id: da248b28d7b681794fa0494ff31fd065680f6fef
