[ao_migration] torch/nn/quantizable: torch.quantization -> torch.ao.quantization (#65901)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65901
This changes the imports in the `caffe2/torch/nn/quantizable` to include the new import locations.
```
codemod -d torch/nn/quantizable --extensions py 'torch.quantization' 'torch.ao.quantization'
```
Test Plan: `python test/run_test.py`
Reviewed By: jerryzh168
Differential Revision: D31301194
fbshipit-source-id: 8ce8a3015ea61da62d7658846d1ca64fbdabaf7a
