Suppress ringtone when the device is on ear

Don't play a (potentially loud) ringtone over a held call when the user
is holding the phone up to the ear (as detected by position sensors).

Also move Telecom tests to the new mockito so that we can mock final
methods/classes.

Bug: 64438244
Test: manual, unit

Change-Id: I685069bb63c6fd47d6a5e62a8c0896c02cd95056