Remove THCDeviceTensor (#65744)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65744
This is just dead code.
Test Plan: Imported from OSS
Reviewed By: navahgar
Differential Revision: D31257940
fbshipit-source-id: 6c02264106c2dcbadd332f24b95bc9351a04fd9e
