ARM: dts: Use label for device nodes in Cygnus dts

Use label instead of full path to reference device nodes in Cygnus dts
files

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm911360k.dts

@@ -42,8 +42,8 @@
 		stdout-path = &uart3;
 		bootargs = "console=ttyS0,115200";
 	};
-
-	uart3: serial@18023000 {
-		status = "okay";
-	};
+};
+
+&uart3 {
+	status = "okay";
 };