arm64: dts: qcom: sc7280-idp: correct ADC channel node name and unit address

Correct SPMI PMIC VADC channel node name:
1. Use hyphens instead of underscores,
2. Add missing unit address.

This fixes `make dtbs_check` warnings like:

  qcom/sc7280-idp.dtb: pmic@0: adc@3100: 'pmk8350_die_temp', 'pmr735a_die_temp' do not match any of the regexes: '^.*@[0-9a-f]+$', 'pinctrl-[0-9]+'
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Reviewed-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: David Heidelberg <david@ixit.cz>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220828084341.112146-12-krzysztof.kozlowski@linaro.org

arch/arm64/boot/dts/qcom/sc7280-idp.dts

@@ -78,7 +78,7 @@ &nvme_3v3_regulator {
 };
 
 &pmk8350_vadc {
-	pmr735a_die_temp {
+	pmr735a-die-temp@403 {
 		reg = <PMR735A_ADC7_DIE_TEMP>;
 		label = "pmr735a_die_temp";
 		qcom,pre-scaling = <1 1>;

arch/arm64/boot/dts/qcom/sc7280-idp.dtsi

@@ -264,7 +264,7 @@ &pcie1_phy {
 };
 
 &pmk8350_vadc {
-	pmk8350_die_temp {
+	pmk8350-die-temp@3 {
 		reg = <PMK8350_ADC7_DIE_TEMP>;
 		label = "pmk8350_die_temp";
 		qcom,pre-scaling = <1 1>;