ARM: mvebu: Add support for NAND controller in Armada 370/XP

The Armada 370 and Armada XP SoC have a NAND controller (aka NFCv2).
This commit adds support for it in Armada 370 and Armada XP SoC
common devicetree.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>