Mock WakeLocks in Telecom for Unit Testing

Currently, the proximity and in-call wakelock controllers use
PowerManager and PowerManager.WakeLock, which are final and can
not be mocked. A container named TelecomWakeLock has been introduced,
which encapsulates WakeLock logic for Unit Testing.

Unit tests are added for the ProximitySensorManager and InCallWakeLockControllerTest.

Change-Id: I4a894d4cd8d9d8952144a41a4d0a4bf4dac4de46