arm64: dts: renesas: r8a779g0: Add RWDT node

Add a device node for the RCLK Watchdog Timer (RWDT) on the Renesas
R-Car V4H (R8A779G0) SoC.

Based on a patch in the BSP by Thanh Quan.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/187904c279be6654ea3deb11b7250b64dd18c3b5.1662715538.git.geert+renesas@glider.be

arch/arm64/boot/dts/renesas/r8a779g0.dtsi

@@ -59,6 +59,17 @@ soc: soc {
 		#size-cells = <2>;
 		ranges;
 
+		rwdt: watchdog@e6020000 {
+			compatible = "renesas,r8a779g0-wdt",
+				     "renesas,rcar-gen4-wdt";
+			reg = <0 0xe6020000 0 0x0c>;
+			interrupts = <GIC_SPI 330 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cpg CPG_MOD 907>;
+			power-domains = <&sysc R8A779G0_PD_ALWAYS_ON>;
+			resets = <&cpg 907>;
+			status = "disabled";
+		};
+
 		cpg: clock-controller@e6150000 {
 			compatible = "renesas,r8a779g0-cpg-mssr";
 			reg = <0 0xe6150000 0 0x4000>;