dbr quant support for custom leaf modules, part 3/x (#70349)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70349
Makes sure that child modules of non traceable leaf modules
do not participate in quantization swaps. This should feature complete
the `non_traceable_module_class` feature.
Test Plan:
```
python test/test_quantization.py TestQuantizeDBR.test_prepare_custom_config_dict_non_traceable_module_class
```
Reviewed By: VitalyFedyunin
Differential Revision: D33296246
Pulled By: vkuzo
fbshipit-source-id: 08287429c89ee6aa42d13ca3060a74679a478181
