Statsd atoms: BatteryVoltage

Add battery voltage to statsd as a pulled atom.

Bug: 114451845
Test: run cts-dev -m CtsStatsdHostTestCases -t android.cts.statsd.atom.HostAtomTests#testBatteryVoltage

Change-Id: If40ed41663b57ad6144c69c52c4c63562f93c774
3 files changed