Add more atoms to statsd

The following events are added to statsd:
WifiLockStateChanged
WifiSignalStrengthChanged
WifiSignalStrengthChanged
PhoneSignalStrengthChanged

Test: manually confirmed these show up in the statslog.
Change-Id: Ifee27c86a28616d8cb9d43bdf11f9cabe2b367c6
3 files changed