boards: renesas: Enable watchdog driver on RSK-RX130-512kb

Enable iwdt dts nodes and iwdtsclk clock on RSK-RX130-512kb

Signed-off-by: Quy Tran <quy.tran.pz@renesas.com>

boards/renesas/rsk_rx130/rsk_rx130.dts

@@ -52,6 +52,7 @@
 		led0 = &led1;
 		led1 = &led3;
 		sw0 = &sw1;
+		watchdog0 = &iwdt;
 	};
 };
 
@@ -72,6 +73,10 @@
 	status = "okay";
 };
 
+&iwdtlsclk {
+	status = "okay";
+};
+
 &cmt {
 	clock-frequency = <4000000>;
 	status = "okay";
@@ -145,3 +150,9 @@
 	pinctrl-names = "default";
 	status = "okay";
 };
+
+&iwdt {
+	window-start = <0x3000>;
+	window-end = <0x0300>;
+	status = "okay";
+};