It is possible that an accessibility service's package was force stopped
during whose handling the death recipient is unlinked and still get a call
on binderDied since the call was made before we unlink but was waiting on
the lock we held during the force stop handling. Added a check whether the
service is already disconnected and if so do nothing.
bug:8600388
Change-Id: I4a9ca305b9863d986b930a7c1ec8f9006b16a333