[vulkan] Remove duplication of op registration and clean unused vars (#44932)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/44932
Test Plan: Imported from OSS
Reviewed By: AshkanAliabadi
Differential Revision: D23778203
Pulled By: IvanKobzarev
fbshipit-source-id: d1bc0a5c2cdd711d8a4cd983154a4f6774987674
