ARM: dts: qcom: pma8084: fix vadc channel node names

The spmi-vadc bindings require the '@' in the node.

Additionally change the node name to adc-chan which both makes it a
generic node name and also removes the underscore from it.

Signed-off-by: Luca Weiss <[e-mail]>
Signed-off-by: Bjorn Andersson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/arm/boot/dts/qcom-pma8084.dtsi

···
 			#size-cells = <0>;
 			#io-channel-cells = <1>;
 
-			die_temp {
+			adc-chan@8 {
 				reg = <VADC_DIE_TEMP>;
 			};
-			ref_625mv {
+
+			adc-chan@9 {
 				reg = <VADC_REF_625MV>;
 			};
-			ref_1250v {
+
+			adc-chan@a {
 				reg = <VADC_REF_1250MV>;
 			};
-			ref_buf_625mv {
+
+			adc-chan@c {
 				reg = <VADC_SPARE1>;
 			};
-			ref_gnd {
+
+			adc-chan@e {
 				reg = <VADC_GND_REF>;
 			};
-			ref_vdd {
+
+			adc-chan@f {
 				reg = <VADC_VDD_VADC>;
 			};
 		};