arm: dts: socfpga: enable watchdog for socfpga platform

Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>

arch/arm/boot/dts/socfpga_cyclone5.dtsi

@@ -49,3 +49,7 @@
 		};
 	};
 };
+
+&watchdog0 {
+	status = "okay";
+};