[ARM] Orion: add support for Orion/MV88F5181 based D-Link DNS-323

With this patch USB, SATA (via sata_mv), Ethernet, RTC, LEDs and NOR Flash
work.

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>
Acked-by: Tzachi Perelstein <tzachi@marvell.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>