Enable TensorPipe's CUDA GDR channel (#50763)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/50763
ghstack-source-id: 120561489
Test Plan: Exported to GitHub
Reviewed By: mrshenli
Differential Revision: D25959672
fbshipit-source-id: b70f4b130806bf430869170bf4412697a6910275
