Enable groupwise for qconv (#21592)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21592
We now support groupwise convolutions for qconv2d
Reviewed By: zafartahirov
Differential Revision: D15739239
fbshipit-source-id: 80b9b4fef5b9ee3d22ebecbaf205b970ab3d4250
