devon:charger bring up

need read usbin voltage
config read usbin voltage channel

Change-Id: Ib9a48185765e32c2dcec040a0c2cddecd7ea688f
Signed-off-by: longc104 <longc104@motorola.com>
Reviewed-on: https://gerrit.mot.com/2227540
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Reviewed-by: Wang Wang <wangwang1@lenovo.com>
Submit-Approved: Jira Key

qcom/discrete_charging_devon.dtsi

@@ -149,7 +149,8 @@
                                 <&wt6670 PSY_IIO_DETECTION_READY>,
                                 <&mmi_chrg PSY_IIO_QC3P_START_POLICY>,
 				<&wt6670 PSY_IIO_START_BC12_DETECTION>,
-				<&wt6670 PSY_IIO_DETECTION_BC12_READY>;
+				<&wt6670 PSY_IIO_DETECTION_BC12_READY>,
+				<&wt6670 PSY_IIO_READ_USBIN_VOLTAGE>;
 
                 io-channel-names = "gpio3_div3",
 				   "wt6670_usb_real_type",
@@ -158,7 +159,8 @@
 				   "wt6670_detection_ready",
 				   "qc3p_start_policy",
 				   "wt6670_start_bc12_detection",
-				   "wt6670_detection_bc12_ready";
+				   "wt6670_detection_bc12_ready",
+				   "read_usbin_voltage";
 
 		interrupt-parent = <&tlmm>;
 		interrupts = <96 0>;            //irq num base on hardware design