arm: add support for the suen3 board from keymile

Add support for the ARM part of the mgcoge2, named suen3.
This board is based on the Marvell Kirkwood (88F6281) SoC.
As there come more board variants, common config options
are collected in include/configs/km_arm.h. Also, this board
use common code for all keymile boards, which is stored in
board/keymile/common/common.c

Signed-off-by: Holger Brunck <holger.brunck@keymile.com>
Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index d6f78de..0340c19 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -413,9 +413,9 @@
 	muas3001	MPC8270
 	municse		MPC5200
 	sc3		PPC405GP
+	suen3		ARM926EJS (Kirkwood SoC)
 	uc101		MPC5200
 
-
 Peter De Schrijver <p2@mind.be>
 
 	ML2		PPC4xx