kirkwood: add NAS62x0 board support

Add support for new boards RaidSonic ICY BOX NAS6210 and NAS6220.

NAS6210 has 1 SATA and 1 eSATA port while NAS6220 has 2 SATA ports.

More information about the boards can be found here:

http://www.raidsonic.de/en/products/nas-systems.php?we_objectID=7036
http://www.raidsonic.de/en/products/nas-systems.php?we_objectID=7515

Signed-off-by: Luka Perkov <uboot@lukaperkov.net>
Signed-off-by: Gerald Kerma <dreagle@doukki.net>
Signed-off-by: Simon Baatz <gmbnomis@gmail.com>
7 files changed