Enable enhanced call blocking by default.

Enable the enhanced call blocking options by default.  This provides
the ability to block:
- private callers - those who have intentionally blocked their number.
- calls from payphones (they still exist)
- unknown callers (not the same as restricted; network may not be able to
determine the number of the caller)
- numbers not in contacts

These options are available in the blocked number screen (on AOSP
from the dialer app go to settings --> Blocked Numbers).

Test: Manual - confirm enhanced call blocking options are available.
Bug: 63966743
Change-Id: I5aab0714774a5406568d6cd04a4d7074a3261c44