BatteryStats: Bump checkin format version to 18
BatteryStats: Bump checkin format version to 18

Bug:28811636
Change-Id: If2229c438e60f20746c91bccbcaa6d72ca5f0802

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base