Don't reference reflection_pad3d in functional.py (#60837)
Summary:
To work around FC issue
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60837
Reviewed By: jbschlosser
Differential Revision: D29421142
Pulled By: ngimel
fbshipit-source-id: f5c1d9c324173b628e286f9005edf7109162066f
