ARM: add initial support for Marvell Berlin SoCs

This adds initial support for the Marvell Berlin SoC family with
Armada 1500 (88DE3100) and Armada 1500-mini (88DE3005) SoCs.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Reviewed-by: Jason Cooper <jason@lakedaemon.net>
Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>