ARM: mvebu: Add Armada 385 Access Point Development Board support

The A385-AP is a board produced by Marvell that holds 3 mPCIe slot, a 16MB
SPI-NOR, 3 Gigabit Ethernet ports, USB3 and NAND flash storage.

[gregory.clement@free-electrons.com: switch the license to the dual
X11/GPL with the agreement of the author]

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>