arch: arm: Enable cp15 barrier
arch: arm: Enable cp15 barrier

Enable cp15 barrier for armv8 architecture for backward
compatibility.

Change-Id: I88dcf4db7af36b29e698565cae17cc07c7ae23a1

Foxda-Tech/polaris-bootable-bootloader-lk,CanarySolutions/little-kernel,M1cha/lktris,efidroid/lk,M1cha/lktris,Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk,CanarySolutions/little-kernel,efidroid/lk,Foxda-Tech/polaris-bootable-bootloader-lk,efidroid/lk,M1cha/lktris,efidroid/lk,CanarySolutions/little-kernel,M1cha/lktris,M1cha/lktris,efidroid/lk,Foxda-Tech/polaris-bootable-bootloader-lk,CanarySolutions/little-kernel,CanarySolutions/little-kernel