ARM64: zynqmp: Enable watchdog on ep108

Enable watchdog on ep108.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

arch/arm64/boot/dts/xilinx/zynqmp-ep108.dts

@@ -70,3 +70,7 @@
 	dr_mode = "host";
 	maximum-speed = "high-speed";
 };
+
+&watchdog0 {
+	status = "okay";
+};