batteryservice: Avoid exception if device doesn't support HVDCP
E BatteryService: Failure in reading charger type E BatteryService: java.io.FileNotFoundException: /sys/class/power_supply/usb/type: open failed: ENOENT (No such file or directory) E BatteryService: at libcore.io.IoBridge.open(IoBridge.java:452) E BatteryService: at java.io.FileInputStream.<init>(FileInputStream.java:76) E BatteryService: at java.io.FileReader.<init>(FileReader.java:42) E BatteryService: at com.android.server.BatteryService$Led.isHvdcpPresent(BatteryService.java:792) E BatteryService: at com.android.server.BatteryService$Led.updateLightsLocked(BatteryService.java:849) E BatteryService: at com.android.server.BatteryService.processValuesLocked(BatteryService.java:501) E BatteryService: at com.android.server.BatteryService.update(BatteryService.java:330) E BatteryService: at com.android.server.BatteryService.-wrap4(BatteryService.java) E BatteryService: at com.android.server.BatteryService$BatteryListener.batteryPropertiesChanged(BatteryService.java:870) E BatteryService: at android.os.IBatteryPropertiesListener$Stub.onTransact(IBatteryPropertiesListener.java:58) E BatteryService: at android.os.Binder.execTransact(Binder.java:453) E BatteryService: Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory) E BatteryService: at libcore.io.Posix.open(Native Method) E BatteryService: at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186) E BatteryService: at libcore.io.IoBridge.open(IoBridge.java:438) E BatteryService: ... 10 more Change-Id: I3ed4d8959a7e492e483fab365cf09612b5302908
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