ARM: DTS: Add watchdog to mt6589

This patch adds the watchdog to the device tree of Mediatek mt6589 SoC.
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm/boot/dts/mt6589.dtsi

@@ -138,5 +138,10 @@ uart3: serial@11009000 {
 			clocks = <&uart_clk>;
 			status = "disabled";
 		};
+
+		wdt: watchdog@010000000 {
+			compatible = "mediatek,mt6589-wdt";
+			reg = <0x10000000 0x44>;
+		};
 	};
 };