Prevent notifications from erroroneously bypassing 'repeat callers' filter

1. Dialer uses a hidden api to check 'is repeat caller' that has side
effects. Update to use a method without side effects
2. Delay the storage of person information until the notification is
canceled, so ranking updates and notification updates don't bypass the
filter. Note, this means that someone calling twice at overlapping
times (?!) wouldn't get through the filter.

Fixes: 29184211
Change-Id: I53ce402a0ed6f5df6f8265d571d401778dacebd3