Try to label emergency number in ril.ecclist

We want to keep conservative by not simply converting emergency service
types information collected from public website (emergency service
categories from neither 3gpp nor carrier network requirement) to emergency
service categories in vendor-implemented IRadio.emergencyDial.

We do want to support display-purpose of emergency service categories
labels as part of the return value of our TelephonyManager API. This
should also apply to old devices with <=1.3 HAL.

These labels come from the android platform emergency number database;
for old Hal, we cannot merge Android platform emergency number database
due to a complicated consideration of other factors in Emergency Function
Framework Support. To achieve that, we want to merge the labels of
emergency service categories if the number appear in the ril.ecclist.

Bug: 124225645
Test: Treehugger
Change-Id: Iaa6b50b8cecf368f19077f9fde9e189f9ce10823