layernorm (#63436)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63436
use MKLDNN layernorm
use mkldnn version 2
address Elias feedback
fix build CI errors
Test Plan: Imported from OSS
Reviewed By: ngimel
Differential Revision: D30388825
Pulled By: Krovatkin
fbshipit-source-id: fb909bfbf53cb8567a43aac40f51c491daeec908
