Add optional data to incoming calls

Add optional data to incoming calls

When a CallService creates an incoming call, allow it to pass a Bundle
of arbitrary data along with the intent. This data will be returned to
the CallService via setIncomingCallId. This makes it easier for
CallServices to match up incoming calls with their IDs.

Change-Id: I52e7e1d0788ecd01aa427e76de7ccf4d9b75f1f0