arm64: dts: renesas: rzg3s-smarc-som: Enable the watchdog interface

Enable the watchdog interface (accessible by Cortex-A of RZ/G3S SoC) on
RZ/G3S SMARC SoM.
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20240122111115.2861835-11-claudiu.beznea.uj@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/rzg3s-smarc-som.dtsi

@@ -336,3 +336,8 @@ mux {
 		};
 	};
 };
+
+&wdt0 {
+	timeout-sec = <60>;
+	status = "okay";
+};