Show a notification for each missed call, and do not show any
notification for incoming rendezvous calls or for accounts with
auto-answer.  Also don't show a missed call notification for declined
calls (using either the notification action or the red hang-up button
in the incoming call view).

GitLab: #1204
Depends-On: Ia20d2827f2b2e5400f233875f91a64f3587bca93
Change-Id: I62fd851908b1517571c32430c42d2dea1b7ab4b2