sec_battery: Remove vbus_present wakelock

The vbus_present wakelock prevents the phone from going into deep sleep when the charger is connected; however, after charging the device with a cable type 6 (unknown cable type) charger, the wakelock is not destroyed after the cable is disconnected and instead remains, draining battery. The Nexus 5 goes into deep sleep while charging, so it's safe to assume that the vbus_present wakelock is unnecessary and can be removed completely.

Signed-off-by: Sultanxda <sultanxda@gmail.com>