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>
diff --git a/boards.cfg b/boards.cfg
index 9460c38..8f01c60 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -153,6 +153,7 @@
 openrd_ultimate              arm         arm926ejs   openrd              Marvell        kirkwood        openrd:BOARD_IS_OPENRD_ULTIMATE
 rd6281a                      arm         arm926ejs   -                   Marvell        kirkwood
 sheevaplug                   arm         arm926ejs   -                   Marvell        kirkwood
+ib62x0                       arm         arm926ejs   ib62x0              raidsonic      kirkwood
 dockstar                     arm         arm926ejs   -                   Seagate        kirkwood
 devkit3250                   arm         arm926ejs   devkit3250          timll          lpc32xx
 jadecpu                      arm         arm926ejs   jadecpu             syteco         mb86r0x