ARM: dts: msm: Add batt_id channel for PM8150B

Add batt_id channel from VADC on PM8150B in case
it cannot be read accurately from RRADC on PM8150B.

Change-Id: Ia1fcb38a844f13d5b3f010735052b3c9c7267463

qcom/pm8150b.dtsi

@@ -393,6 +393,14 @@
 				qcom,pre-scaling = <1 1>;
 			};
 
+			bat_id@4b {
+				reg = <ADC_BAT_ID_PU2>;
+				label = "bat_id";
+				qcom,ratiometric;
+				qcom,hw-settle-time = <200>;
+				qcom,pre-scaling = <1 1>;
+			};
+
 			smb1390_therm@e {
 				reg = <ADC_AMUX_THM2>;
 				label = "smb1390_therm";