Add control commands for Mock Ril

- Hangup a call remotely for the given cause.
- Set call transition flag
- set call to alert
- set call to active
- add a dialing call (this is for testing purpose

Add ril request support: RIL_REQUEST_LAST_CALL_FAIL_CAUSE

Change-Id: I56d0a10a7bff31eb11f4f9b64b53acf7931e6cb7
18 files changed