ARM: dts: aspeed: mtmitchell: Remove redundant ADC configurations

Mt.Mitchell DVT and later hardware do not use adc1. It only uses
adc0 with channels 0, 1 and 2. This commit removes redundant ADC
configurations.

Signed-off-by: Chanh Nguyen <chanh@os.amperecomputing.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20231005035525.19036-7-chanh@os.amperecomputing.com
Signed-off-by: Joel Stanley <joel@jms.id.au>

Author: chnguyen-ampere

arch/arm/boot/dts/aspeed/aspeed-bmc-ampere-mtmitchell.dts

@@ -551,20 +551,7 @@
 
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_adc0_default &pinctrl_adc1_default
-		&pinctrl_adc2_default &pinctrl_adc3_default
-		&pinctrl_adc4_default &pinctrl_adc5_default
-		&pinctrl_adc6_default &pinctrl_adc7_default>;
-};
-
-&adc1 {
-	ref_voltage = <2500>;
-	status = "okay";
-
-	pinctrl-names = "default";
-	pinctrl-0 = <&pinctrl_adc8_default &pinctrl_adc9_default
-		&pinctrl_adc10_default &pinctrl_adc11_default
-		&pinctrl_adc12_default &pinctrl_adc13_default
-		&pinctrl_adc14_default &pinctrl_adc15_default>;
+		&pinctrl_adc2_default>;
 };
 
 &vhub {