Implement isInEmergencySmsMode for emergency SMS

When an SMS is sent, check to see if the destination is to
an emergency number. If so, put telephony in an emergency SMS
mode for a carrier determined amount of time for location queries
from the network will be serviced, independent of user settings.

Bug: 126091115
Test: atest FrameworksTelephonyTests
Change-Id: I4a5f7f4c6a0ad8a9506f6436e08d347bdf242f0d