ARM: add Marvell Berlin SoCs to multi_v7_defconfig

This adds the Marvell Berlin SoC family, Marvell Armada 1500
(BG2), and Marvell Armada 1500-mini (BG2CD) to the multi_v7_defconfig.

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>