arm/km: remove portl2.h and use km_kirkwood instead

The additional headerfile is unneeded here, we can use the generic
km_kirkwood.h instead. And we can use the better config option
KM_PIGGY4_88E6061 for the specific features for boards with this
design in km_arm.c.

Signed-off-by: Holger Brunck <holger.brunck@keymile.com>
Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
cc: Gerlando Falauto <gerlando.falauto@keymile.com>
cc: Prafulla Wadaskar <prafulla@marvell.com>
diff --git a/board/keymile/km_arm/km_arm.c b/board/keymile/km_arm/km_arm.c
index 831cbd9..daab27b 100644
--- a/board/keymile/km_arm/km_arm.c
+++ b/board/keymile/km_arm/km_arm.c
@@ -317,7 +317,7 @@
 	}
 }
 
-#if (defined(CONFIG_KM_MGCOGE3UN)|defined(CONFIG_PORTL2))
+#if (defined(CONFIG_KM_PIGGY4_88E6061))
 
 #define	PHY_LED_SEL	0x18
 #define PHY_LED0_LINK	(0x5)