Test app for call companion app

A two-button test app that provides a means to trigger CDM association
and disassociation with the profile that should grant the third party
InCallService the permission to bind to Telecom.

How to use:
1) Install the app
2) Click on Start Association
3) Pair a bluetooth device
4) Use the Phone to receive an incoming call
5) Should observe a toast saying "OnCallAdded"
6) End the call, should observe a toast saying "OnCallRemoved"
6) Click on Stop Association
7) Use the Phone to receive an incoming call, and disconnect the call
8) Should not observe a toast saying "OnCallAdded" or "OnCallRemoved"

Test: manual
Bug: 169595473
Change-Id: I3581f8dff1278c7fa85b8ae3e7c8906f30c35e41
(cherry picked from commit f9249680)