arm64: renesas: r8a7796 dtsi: Add device node for RST module

Add a device node for the RST module, which provides a.o. reset control
and mode pin monitoring.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Dirk Behme <dirk.behme@de.bosch.com>

arch/arm64/boot/dts/renesas/r8a7796.dtsi

@@ -233,6 +233,11 @@
 			#power-domain-cells = <0>;
 		};
 
+		rst: reset-controller@e6160000 {
+			compatible = "renesas,r8a7796-rst";
+			reg = <0 0xe6160000 0 0x0200>;
+		};
+
 		sysc: system-controller@e6180000 {
 			compatible = "renesas,r8a7796-sysc";
 			reg = <0 0xe6180000 0 0x0400>;