ARM: dts: aspeed: wedge400: Enable more ADC channels

Enable ASPEED-ADC channels 5-8 to support voltage monitoring of all the
Wedge400 hardware revisions.
Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20230803230324.731268-3-rentao.bupt@gmail.comSigned-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-wedge400.dts

@@ -59,7 +59,8 @@ chosen {
 
 	ast-adc-hwmon {
 		compatible = "iio-hwmon";
-		io-channels = <&adc 0>, <&adc 1>, <&adc 2>, <&adc 3>, <&adc 4>;
+		io-channels = <&adc 0>, <&adc 1>, <&adc 2>, <&adc 3>, <&adc 4>,
+			      <&adc 5>, <&adc 6>, <&adc 7>, <&adc 8>;
 	};
 
 	/*