Re-enable fast winograd conv on IOS (#56021)
Summary:
This is the proper fix for https://github.com/pytorch/pytorch/issues/38186
husthyc tested locally that it indeed fixes the issue there.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/56021
Reviewed By: ailzhang
Differential Revision: D27940362
Pulled By: albanD
fbshipit-source-id: 020743315ce055633324ccd751c457e32ea3263d
