mpc85xx: provide label MAC address

This patch adds the label MAC address for some devices in
mpc85xx.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/mpc85xx/files/arch/powerpc/boot/dts/hiveap-330.dts

@@ -19,6 +19,7 @@
 		led-failsafe = &tricolor_red;
 		led-running = &tricolor_green;
 		led-upgrade = &tricolor_red;
+		label-mac-device = &enet0;
 	};
 
 	chosen {

target/linux/mpc85xx/files/arch/powerpc/boot/dts/tl-wdr4900-v1.dts

@@ -28,6 +28,7 @@
 		led-failsafe = &system_green;
 		led-running = &system_green;
 		led-upgrade = &system_green;
+		label-mac-device = &enet0;
 	};
 
 	memory {