Populate 'hasKnownUserIntentEmergency' in RIL framework

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.

Test: Manual
Bug: 123999640
Change-Id: I153d5bf1951bc162183bee77357ec6d6f92d0704