arm64: dts: renesas: white-hawk-cpu: Enable watchdog timer

Enable the watchdog timer on the White Hawk CPU board.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/77a0e29d965032115de1f07ceecb2d5d07db74eb.1662715538.git.geert+renesas@glider.be

arch/arm64/boot/dts/renesas/r8a779g0-white-hawk-cpu.dtsi

@@ -43,3 +43,8 @@ &hscif0 {
 &scif_clk {
 	clock-frequency = <24000000>;
 };
+
+&rwdt {
+	timeout-sec = <60>;
+	status = "okay";
+};