arm64: dts: renesas: eagle: Enable watchdog timer

Enable the Watchdog Timer (WDT) controller on the Renesas Eagle
board equipped with an R-Car V3M (r8a77970) SoC.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a77970-eagle.dts

@@ -52,6 +52,11 @@
 	clock-frequency = <32768>;
 };
 
+&rwdt {
+	timeout-sec = <60>;
+	status = "okay";
+};
+
 &scif0 {
 	status = "okay";
 };