ARM: dts: r8a7791: 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/arm/boot/dts/r8a7791.dtsi

@@ -1482,6 +1482,11 @@ R8A7791_CLK_SCIFA3 R8A7791_CLK_SCIFA4 R8A7791_CLK_SCIFA5
 		};
 	};
 
+	rst: reset-controller@e6160000 {
+		compatible = "renesas,r8a7791-rst";
+		reg = <0 0xe6160000 0 0x0100>;
+	};
+
 	sysc: system-controller@e6180000 {
 		compatible = "renesas,r8a7791-sysc";
 		reg = <0 0xe6180000 0 0x0200>;