fix internal targets for layernorm (#39501)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/39501
fix internal targets, and disable the test until it is fixed
Test Plan:
built and ran the test, but venkat has to get access to nnpi before
fine tuning the last few pieces. Currently getting around 1e-5 relative error
Reviewed By: yinghai
Differential Revision: D21875657
fbshipit-source-id: 3ae762093084fa65b9aeedaef1b2ca1b1e13b587
