Display "Emergency number" in the call log for emergency numbers

This CL updates the call log to show "Emergency number" for call log rows from
numbers that PhoneNumberUtils.isEmergencyNumber considers to be emergency
numbers.

Bug: 66926712
Test: Manual, see above
PiperOrigin-RevId: 189953302
Change-Id: Ibaae243ead8b918a26f6058164316e042a4f82fd