[pytorch] clean up normalized_dynamic_type() hack (#44889)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44889
This HACK doesn't seem to be necessary any more - there is no 'real'
type in generated Declarations.yaml file.
Verified by comparing generated code before/after.
Test Plan: Imported from OSS
Reviewed By: ezyang
Differential Revision: D23761624
Pulled By: ljk53
fbshipit-source-id: de996f04d77eebea3fb9297dd90a8ebeb07647bb
