Populate 'hasKnownUserIntentEmergency' flag

This is only used to specify when the dialed number is ambiguous,
identified as both emergency number and any other non-emergency number;
e.g. in some situation, 611 could be both an emergency number in a
country and a non-emergency number of a carrier's customer service hotline.

Bug: 123999640
Test: Manual
Change-Id: I222bca72b0625b98e2afb2b3841d5636578b473d