Kill kwarg_only declarations in Declarations.cwrap. (#25609)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25609
They don't do anything anymore.
Test Plan: Imported from OSS
Differential Revision: D17172497
Pulled By: gchanan
fbshipit-source-id: 5cf7fdcf7d2da0054ac1bd7d8d2b70a2264b8c93
