[caffe2/server quant] use new depthwise conv fbgemm interface (#71166)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71166
Remove the use of deprecated old interface
Test Plan: CI
Reviewed By: jiyuanzFB
Differential Revision: D33533494
fbshipit-source-id: 930eb93cd67c7a9bb77708cc48914aa0c9f1c841
