add torch.diff support for n greater than 1 (#67260)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/67260
Addressing 54853
Test Plan: Imported from OSS
Reviewed By: mruberry
Differential Revision: D31930294
Pulled By: mikaylagawarecki
fbshipit-source-id: 97c7a27e9200c6688242680ff96b73dfff828479
