ai-pep: align qconv benchmark to conv (#36673)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/36673
Slight changes to the qconv benchmark to make it match the floating
point benchmark, so we can compare across the two better.
Test Plan:
```
cd benchmarks/operator_benchmark
python -m pt.qconv_test --tag_filter all
python -m pt.conv_test --tag_filter all
```
Imported from OSS
Differential Revision: D21102563
fbshipit-source-id: d11c1e4c13d4c5fa1f2332c687aee6889c81b659
