ARM: dts: lpc18xx: add watchdog node

Add node for the watchdog timer found on LPC18xx/LPC43xx.
Signed-off-by: Ariel D'Alessandro <ariel@vanguardiasur.com.ar>
Signed-off-by: Joachim Eastwood <manabian@gmail.com>

arch/arm/boot/dts/lpc18xx.dtsi

@@ -223,6 +223,14 @@ rgu: reset-controller@40053000 {
 			#reset-cells = <1>;
 		};
 
+		watchdog@40080000 {
+			compatible = "nxp,lpc1850-wwdt";
+			reg = <0x40080000 0x24>;
+			interrupts = <49>;
+			clocks = <&cgu BASE_SAFE_CLK>, <&ccu1 CLK_CPU_WWDT>;
+			clock-names = "wdtclk", "reg";
+		};
+
 		uart0: serial@40081000 {
 			compatible = "nxp,lpc1850-uart", "ns16550a";
 			reg = <0x40081000 0x1000>;