ARM: mvebu: Add support for NOR flash device on Armada XP-DB board

The Armada XP Development Board (DB-78460-BP) has a NOR flash device
connected to the Device Bus. This commit adds the device tree node
to support this device.

This SoC supports a flexible and dynamic decoding window allocation
scheme; but since this feature is still not implemented we need
to specify the window base address in the device tree node itself.

This base address has been selected in a completely arbitrary fashion.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
arm: mvebu: enable the third USB interface on OpenBlocks AX3

Besides the two "classic" USB interfaces with normal USB ports on the
front side, the PlatHome OpenBlocks AX3 uses the third USB interface
of the Marvell SoC in the mini-PCIe connector. This allows certain
mini-PCIe cards to expose parts of their functionality as a USB
peripheral.

This commit enables this third USB interface in the OpenBlocks AX3
Device Tree, and also adds comments on top of the two other USB
interfaces so that the Device Tree makes it clear which USB interface
at the SoC level matches which USB interface visible on the board.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Tested-by: Atsushi Yamagata <yamagata@plathome.co.jp>
Tested-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>