BatteryMonitor: Add helper of logValues()

... that logs values for an arbitrary health info and
health config.

This allows health 2.1 HAL implementation to log the
updated health info struct, which is not stored in
BatteryMonitor.

Test: healthd kernel log has correct values
Bug: 179326883
Change-Id: I394ef3f317229f94f4db82de5635d9380c183394