Simplified nnq.Linear class (#24046)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/24046
`nnq.Linear` was a confusing mess of buffers/attributes and Tensor/not tensor members. This PR reworks it to consistently have only Python attributes, with the conversions handled explicitly by state_dict or __{get,set}state__ methods (added in PRs further up the stack
Test Plan: Imported from OSS
Reviewed By: driazati
Differential Revision: D16728345
Pulled By: jamesr66a
fbshipit-source-id: 47468b776b428fca2409bb55c8b161afb68a3379
