fuji: fix healthd battery paths

* 4.4 introduces a new daemon, healthd, that handles battery status
    - resides in: /system/core/healthd
    - BatteryMonitor.cpp iterates through all the *directories* under
      /sys/class/power_supply looking for a file called 'type'
    - if the type == Battery, it assumes this is the location for the
      battery stats for the device. Only the first directory that matches
      this criteria is used.
    - Unfortunately, healthd looks in the wrong path on some devices.
* For comparison, in 4.3 battery statistics gathering was handled by
    frameworks/base/services/jni/com_android_server_BatteryService.cpp
    - BatteryService does a similar search for a file called 'type' with
      the contents of 'Battery'
    - But the search logic is different here: it takes the *last* path that
      matches the criteria.
    - This results in the correct /sys/class/power_supply/battery
* This patch overrides the discovery mechanism for battery status completely.

* Original idea taken from: https://github.com/temasek/android_device_samsung_smdk4412-common/commit/3a05ddadae64e5589e7b2f9cfbda89f497763e0b