[JIT] Update Namespace from cuda to _cuda (#53378)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/53378
Test Plan: Imported from OSS
Reviewed By: navahgar
Differential Revision: D26970607
Pulled By: nikithamalgifb
fbshipit-source-id: 20a55dd9c0071c5870a4b176d30cb9c1e1496687
