ARM: dts: aspeed: wedge40: Enable ADC device

Enable ADC controller and corresponding voltage sensoring channels for
Wedge40.

Signed-off-by: Tao Ren <[email protected]>
Signed-off-by: Joel Stanley <[email protected]>

Author: tao-ren

arch/arm/boot/dts/aspeed-bmc-facebook-wedge40.dts

@@ -27,6 +27,11 @@
 	memory@40000000 {
 		reg = <0x40000000 0x20000000>;
 	};
+
+	ast-adc-hwmon {
+		compatible = "iio-hwmon";
+		io-channels = <&adc 5>, <&adc 6>, <&adc 7>, <&adc 8>, <&adc 9>;
+	};
 };
 
 &wdt1 {
@@ -126,3 +131,7 @@
 &vhub {
 	status = "okay";
 };
+
+&adc {
+	status = "okay";
+};