[LTC] Export torch::lazy::GetBackendDevice() (#70963)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70963
This commit exports torch::lazy::GetBackendDevice().
Test Plan: CI in the lazy_tensor_staging branch.
Reviewed By: wconstab
Differential Revision: D33468938
Pulled By: alanwaketan
fbshipit-source-id: f65599c9238bf6b4f4ffbd5194befdc267272831
