remove AutoNonVariableTypeMode from jit-op-registry (#28402)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/28402
Revert PR #27274 as it's absorbed by PR #28398.
Test Plan: - make sure all mobile models can load and run
Differential Revision: D18055993
Pulled By: ljk53
fbshipit-source-id: 0d0ffdf2cfae18577189d3b69de15fa892210916
