arm64: dts: qcom: pm8998: Add die temperature channel node to the ADC

Add a channel node for the die temperature to the ADC.
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>

arch/arm64/boot/dts/qcom/pm8998.dtsi

@@ -75,6 +75,11 @@ pm8998_adc: adc@3100 {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			#io-channel-cells = <1>;
+
+			adc-chan@ADC5_DIE_TEMP {
+				reg = <ADC5_DIE_TEMP>;
+				label = "die_temp";
+			};
 		};
 
 		rtc@6000 {