ARM: dts: alt: Enable watchdog support

Enable the watchdog, so the board can be restarted by a watchdog
timeout.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7794-alt.dts

@@ -330,6 +330,11 @@ &mmcif0 {
 	status = "okay";
 };
 
+&rwdt {
+	timeout-sec = <60>;
+	status = "okay";
+};
+
 &sdhi0 {
 	pinctrl-0 = <&sdhi0_pins>;
 	pinctrl-1 = <&sdhi0_pins_uhs>;