Refactor CuFFTConfig to not use tensor objects (#46909)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/46909
Test Plan: Imported from OSS
Reviewed By: ngimel
Differential Revision: D25083884
Pulled By: mruberry
fbshipit-source-id: 15f8ec1da1a457811cf118a3adf2941c4b0a6a37
