Revision of CallRedirectionService API Review

- onBind should be final (I think also for onUnBind)
- Remove verbose logging
- Document redirectCall/placeCallUnmodified/cancelCall can only be
called from onPlaceCall

Bug: 112303670
Test: compile
Change-Id: I7d70a5ac3063a638d9383f69c99e4c1f822e8948