enable assymetric dilations and stride for miopen conv (#17472)
Summary:
As of MIOpen 1.7.1 as shipped in ROCm 2.1 this works correctly and we can use MIOpen and do not need to fall back
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17472
Differential Revision: D14210323
Pulled By: ezyang
fbshipit-source-id: 4c08d0d4623e732eda304fe04cb722c835ec70e4
