fx quant: enable linear-bn1d fusion for PTQ (#66484)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66484
https://github.com/pytorch/pytorch/pull/50748 added linear - bn1d fusion
in Eager mode, for PTQ only. This PR also enables this in FX graph mode.
We reuse the existing conv-bn-relu fusion handler, renaming `conv` to
`conv_or_linear` for readability.
The QAT version is saved for a future PR, for both eager and FX graph.
Test Plan:
```
python test/test_quantization.py TestFuseFx.test_fuse_linear_bn_eval
```
Imported from OSS
Reviewed By: bdhirsh
Differential Revision: D31575392
fbshipit-source-id: f69d80ef37c98cbc070099170e335e250bcdf913
