Add A72 support for Juno R2
Add A72 support for Juno R2

Cortex-A72 library support is now compiled into the Juno platform port to go
with the existing A53/A57 support. This enables a single set of Juno TF
binaries to run on Juno R0, R1 and R2 boards.

Change-Id: I4a601dc4f671e98bdb19d98bbb66f02f0d8b7fc7

davwan01/arm-trusted-firmware,sandrine-bailleux/arm-trusted-firmware,jcastillo-arm/arm-trusted-firmware,sbranden/arm-trusted-firmware,lsigithub/arm-trusted-firmware_public,achingupta/arm-trusted-firmware,davwan01/arm-trusted-firmware,sandrine-bailleux-arm/arm-trusted-firmware,sandrine-bailleux-arm/arm-trusted-firmware,lsigithub/arm-trusted-firmware_public,achingupta/arm-trusted-firmware,sbranden/arm-trusted-firmware,sandrine-bailleux/arm-trusted-firmware,jcastillo-arm/arm-trusted-firmware