Update health@1.0 batteryVoltage units.

Both framework BatteryService and all implementations (that uses
BatteryMonitor) uses millivolts for batteryVoltage.

maxChargingVoltage is microvolts and that is correct.

Fixes: 115881119
Test: treehugger

Change-Id: I64044489fe6d56e0d211085d9536fe5cfd95efc4
2 files changed