RegisterDispatchKey.cpp: remove redundant code (#68983)
Summary:
remove the line since line 10 has already included this header file
Pull Request resolved: https://github.com/pytorch/pytorch/pull/68983
Reviewed By: samdow
Differential Revision: D32706952
Pulled By: soulitzer
fbshipit-source-id: 98746e12d8d04d64ee2e0449e4aec5153ac723d5
