arm64: dts: qcom: pm8998: Add adc node

This adds the adc node to pm8998 based on the examples in the
bindings. It also fixes the order of the included headers.
Signed-off-by: NMatthias Kaehlcke <mka@chromium.org>
Reviewed-by: NDouglas Anderson <dianders@chromium.org>
Signed-off-by: NAndy Gross <andy.gross@linaro.org>

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

 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
 /* Copyright 2018 Google LLC. */
 
-#include <dt-bindings/spmi/spmi.h>
+#include <dt-bindings/iio/qcom,spmi-vadc.h>
 #include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/spmi/spmi.h>
 
 &spmi_bus {
 	pm8998_lsid0: pmic@0 {
@@ -11,6 +12,15 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 
+		pm8998_adc: adc@3100 {
+			compatible = "qcom,spmi-adc-rev2";
+			reg = <0x3100>;
+			interrupts = <0x0 0x31 0x0 IRQ_TYPE_EDGE_RISING>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			#io-channel-cells = <1>;
+		};
+
 		pm8998_gpio: gpios@c000 {
 			compatible = "qcom,pm8998-gpio", "qcom,spmi-gpio";
 			reg = <0xc000>;