ARM: 8784/1: NOMMU: Allow enter in Hyp mode

ARMv8R adds support for virtualisation extension (with some deviation
from v8A). With this patch hyp-unaware boot code can offload to kernel
setting up HYP stuff in a sane state.

Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>