ARM: dts: aspeed: Disable unused ADC channels for Asrock X570D4U BMC

Additionally adds labels describing the ADC channels.
Signed-off-by: Renze Nicolai <renze@rnplus.nl>
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>

arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-x570d4u.dts

@@ -337,20 +337,17 @@ fan@5 {
 &adc {
 	status = "okay";
 	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
-				&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-0 = <&pinctrl_adc0_default       /* 3VSB */
+			&pinctrl_adc1_default    /* 5VSB */
+			&pinctrl_adc2_default    /* VCPU */
+			&pinctrl_adc3_default    /* VSOC */
+			&pinctrl_adc4_default    /* VCCM */
+			&pinctrl_adc5_default    /* APU-VDDP */
+			&pinctrl_adc6_default    /* PM-VDD-CLDO */
+			&pinctrl_adc7_default    /* PM-VDDCR-S5 */
+			&pinctrl_adc8_default    /* PM-VDDCR */
+			&pinctrl_adc9_default    /* VBAT */
+			&pinctrl_adc10_default   /* 3V */
+			&pinctrl_adc11_default   /* 5V */
+			&pinctrl_adc12_default>; /* 12V */
 };