Remove deprecated string torch::lazy::BackendDevice constructor (#76506)
Summary:
Remove deprecated string torch::lazy::BackendDevice constructor, re-landing part of https://github.com/pytorch/pytorch/pull/76264.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/76506
Reviewed By: dagitses
Differential Revision: D35993059
Pulled By: alanwaketan
fbshipit-source-id: c859331919447ecfa56a9a57a3324305b7904fc2
(cherry picked from commit 2e99b1533425693a6575405f8806551efb2002e4)
