Add a very minimalistic set of Northstar Plus Device Tree files which
describes the SoC and the BCM958625 implementation. The perpherials
described are:
ARM Cortex A9 CPU
2 8250 UARTs
ARM GIC
PL310 L2 Cache
ARM A9 Global timer
Signed-off-by: Kapil Hali <kapilh@broadcom.com> Signed-off-by: Jon Mason <jonmason@broadcom.com> Reviewed-by: Ray Jui <rjui@broadcom.com> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>