Make spatial depthwise convolution warp size aware (#25922)
Summary:
Use new macro and remove hard-coded path.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25922
Differential Revision: D17286444
Pulled By: bddppq
fbshipit-source-id: 21bfb6053258af3ccfe1f2a6e5c17faa31602e28
