Support for Power7+ in-Nest cryptographic accleration

configname: CONFIG_CRYPTO_DEV_NX

Linux Kernel Configuration
└─>Cryptographic API
└─>Hardware crypto devices
└─>Support for Power7+ in-Nest cryptographic accleration
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Support for Power7+ in-Nest cryptographic acceleration. This
module supports acceleration for AES and SHA2 algorithms. If you
choose 'M' here, this module will be called nx_crypto.