km/rgmii: port Ethernet interface of KM Kirkwood boards to driver model

Activate the driver model for the Ethernet interface (RGMII) in the KM
Kirkwood Kconfig file. Additionally, raise the auto negotiation timeout
to eight seconds as more time is required for those boards.

Signed-off-by: Pascal Linder <pascal.linder@edu.hefr.ch>
Signed-off-by: Holger Brunck <holger.brunck@ch.abb.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/include/configs/km/km_arm.h b/include/configs/km/km_arm.h
index 96227b1..d12d187 100644
--- a/include/configs/km/km_arm.h
+++ b/include/configs/km/km_arm.h
@@ -82,6 +82,7 @@
 /*
  * Ethernet Driver configuration
  */
+#define PHY_ANEG_TIMEOUT	8000	/* PHY needs a longer autoneg timeout */
 #define CONFIG_MVGBE_PORTS	{1, 0}	/* enable port 0 only */
 #define CONFIG_PHY_BASE_ADR	0