Eliminate dependence on broadcasts to trampoline calls to Telecom.

The ACTION_CALL intent was trampolined from UserCallActivity to
Telecom via a broadcast.  This is unfortunate as it means that delays in
the broadcast queue can delay outgoing calls.
Removing this dependence by relying on a TelecomManager API instead.

Test: Ensure ACTION_CALL intents are trampolined to Telecom.
Bug: 116719392
Change-Id: I5dec39c2dc8d666e3580bd23bb3f5a2b3b9d9253