batteryservice: Add max charging voltage

Bug: 25229483
Change-Id: I4b6dd13870c41907c708f32412261efdca826023
diff --git a/include/batteryservice/BatteryService.h b/include/batteryservice/BatteryService.h
index 9a8e2f7..912dcf6 100644
--- a/include/batteryservice/BatteryService.h
+++ b/include/batteryservice/BatteryService.h
@@ -58,6 +58,7 @@
     bool chargerUsbOnline;
     bool chargerWirelessOnline;
     int maxChargingCurrent;
+    int maxChargingVoltage;
     int batteryStatus;
     int batteryHealth;
     bool batteryPresent;