keymile boards: move keymile specific header in subdir

Collect all keymile specific common headers in include/configs/km.

Signed-off-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
cc: Wolfgang Denk <wd@denx.de>
cc: Detlev Zundel <dzu@denx.de>
cc: Prafulla Wadaskar <prafulla@marvell.com>
cc: Kim Phillips <kim.phillips@freescale.com>
cc: Holger Brunck <holger.brunck@keymile.com>
diff --git a/include/configs/mgcoge2un.h b/include/configs/mgcoge2un.h
index d3c7bdc..6256035 100644
--- a/include/configs/mgcoge2un.h
+++ b/include/configs/mgcoge2un.h
@@ -35,7 +35,7 @@
 #define _CONFIG_MGCOGE2UN_H
 
 /* include common defines/options for all arm based Keymile boards */
-#include "km_arm.h"
+#include "km/km_arm.h"
 
 /*
  * Version number information