Xenial SRU - AES-XTS poor performance in Ubuntu 16.04

[Tim Gardner]

https://bugs.launchpad.net/bugs/1613295

[PATCH 1/6] crypto: vmx: Only call enable_kernel_vsx()
[PATCH 2/6] powerpc: Create disable_kernel_{fp,altivec,vsx,spe}()
[PATCH 3/6] crypto: vmx - Adding asm subroutines for XTS
[PATCH 4/6] crypto: xts - consolidate sanity check for keys
[PATCH 5/6] crypto: vmx - Adding support for XTS
[PATCH 6/6] crypto: vmx - Fix aes_p8_xts_decrypt build failure

rtg