arm64: dts: qcom: pmi8998: add rradc node

Add a DT node for the Round Robin ADC found in the PMI8998 PMIC.
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221016180330.1912214-2-caleb.connolly@linaro.org

arch/arm64/boot/dts/qcom/pmi8998.dtsi

@@ -18,6 +18,14 @@ pmi8998_gpio: gpio@c000 {
 			interrupt-controller;
 			#interrupt-cells = <2>;
 		};
+
+		pmi8998_rradc: adc@4500 {
+			compatible = "qcom,pmi8998-rradc";
+			reg = <0x4500>;
+			#io-channel-cells = <1>;
+
+			status = "disabled";
+		};
 	};
 
 	pmi8998_lsid1: pmic@3 {