Merge changes from topic "qemu-sbsa-topology-psci" into integration

* changes:
  qemu/qemu_sbsa: add support for sbsa-ref Embedded Controller
  qemu/qemu_sbsa: topology is different from qemu so add handling
  qemu/common : change DEVICE2 definition for MMU
  qemu/aarch64/plat_helpers.S : calculate the position shift