Revert "pin_memory support for NT (#110404)"
This reverts commit 3597325bc7f07d97ded1c94c47bb59c98e080a0f.
Reverted https://github.com/pytorch/pytorch/pull/110404 on behalf of https://github.com/kit1980 due to Previous PR in the stack caused CUDA memory leaks ([comment](https://github.com/pytorch/pytorch/pull/110404#issuecomment-1749850211))
