dts: renesas: rx: add iwdt property node for watchdog driver

Add iwdt property node on dts for watchdog driver

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

Author: quytranpzz

dts/rx/renesas/rx130-common.dtsi

@@ -507,5 +507,12 @@
 			zephyr,memory-region = "OFSM";
 			status = "okay";
 		};
+
+		iwdt: watchdog@88030 {
+			compatible = "renesas,rx-iwdt";
+			reg = <0x00088030 0x10>;
+			clocks = <&iwdtlsclk 0 0>;
+			status = "disabled";
+		};
 	};
 };