Attempt to enable CrossMapLRN2d, as it no longer uses Module._backend.
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/25343
Test Plan: Imported from OSS
Differential Revision: D17101574
Pulled By: gchanan
fbshipit-source-id: 71d40f5c2a9c94a71abc52e61f6f7be449a2b41a
