ARM: dts: r8a7779: Add device node for RESET/WDT module

Add a device node for the RESET/WDT module, which provides a.o. reset
control, mode pin monitoring, and watchdog control.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Dirk Behme <dirk.behme@de.bosch.com>

arch/arm/boot/dts/r8a7779.dtsi

@@ -590,6 +590,11 @@ R8A7779_CLK_MMC1 R8A7779_CLK_MMC0
 		};
 	};
 
+	rst: reset-controller@ffcc0000 {
+		compatible = "renesas,r8a7779-reset-wdt";
+		reg = <0xffcc0000 0x48>;
+	};
+
 	sysc: system-controller@ffd85000 {
 		compatible = "renesas,r8a7779-sysc";
 		reg = <0xffd85000 0x0200>;