ppc/km: convert KM_DEF_NETDEV to Kconfig

Remove this from the board header files and move it to Kconfig. Also use
the correct default address for kmtegr1.

Signed-off-by: Holger Brunck <holger.brunck@ch.abb.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
CC: Priyanka Jain <priyanka.jain@nxp.com>
CC: Valentin Longchamp <valentin.longchamp@ch.abb.com>
diff --git a/board/keymile/Kconfig b/board/keymile/Kconfig
index acaa928..5f512d5 100644
--- a/board/keymile/Kconfig
+++ b/board/keymile/Kconfig
@@ -62,6 +62,12 @@
 	help
 	  TTY console to use on board.
 
+config KM_DEF_NETDEV
+	string "Default Netdevice"
+	default "eth0"
+	help
+	  Default netdevice for debug interface
+
 config KM_COMMON_ETH_INIT
 	bool "Common Ethernet Initialization"
 	default y if KIRKWOOD || MPC83xx