arm64: dts: renesas: r8a774a1: Add RWDT node

Add a device node for the Watchdog Timer (RWDT) controller on the Renesas
RZ/G2M (r8a774a1) SoC.
Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a774a1.dtsi

@@ -123,6 +123,16 @@ soc {
 		#size-cells = <2>;
 		ranges;
 
+		rwdt: watchdog@e6020000 {
+			compatible = "renesas,r8a774a1-wdt",
+				     "renesas,rcar-gen3-wdt";
+			reg = <0 0xe6020000 0 0x0c>;
+			clocks = <&cpg CPG_MOD 402>;
+			power-domains = <&sysc 32>;
+			resets = <&cpg 402>;
+			status = "disabled";
+		};
+
 		cpg: clock-controller@e6150000 {
 			compatible = "renesas,r8a774a1-cpg-mssr";
 			reg = <0 0xe6150000 0 0x0bb0>;