ARM: dts: aspeed: drop unused ref_voltage ADC property

Aspeed ADC "ref_voltage" property is neither documented nor used.

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Andrew Jeffery <[email protected]>

Author: krzk

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

@@ -813,7 +813,6 @@
 };
 
 &adc0 {
-	ref_voltage = <2500>;
 	status = "okay";
 
 	pinctrl-names = "default";

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

@@ -211,7 +211,6 @@
 };
 
 &adc0 {
-	ref_voltage = <2500>;
 	status = "okay";
 	pinctrl-0 = <&pinctrl_adc0_default &pinctrl_adc1_default
 			&pinctrl_adc2_default &pinctrl_adc3_default
@@ -220,7 +219,6 @@
 };
 
 &adc1 {
-	ref_voltage = <2500>;
 	status = "okay";
 	pinctrl-0 = <&pinctrl_adc8_default &pinctrl_adc10_default
 			&pinctrl_adc11_default &pinctrl_adc12_default

arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite4.dts

@@ -603,7 +603,6 @@
 };
 
 &adc0 {
-	ref_voltage = <2500>;
 	status = "okay";
 	pinctrl-0 = <&pinctrl_adc0_default &pinctrl_adc1_default
 			&pinctrl_adc2_default &pinctrl_adc3_default
@@ -612,7 +611,6 @@
 };
 
 &adc1 {
-	ref_voltage = <2500>;
 	status = "okay";
 	pinctrl-0 = <&pinctrl_adc8_default &pinctrl_adc9_default>;
 };