(Emergency Call Improvement) Seperated codes related to hal version below & above 1.4

Rearranged all the code which are dependent on hal version into seperate methods. So that will be easy to deprecate older version. From Hal version 1.4 emergency number are obtained from radio indication. For version less than 1.4 emergency number are obtained from ril.ecclist

Test: atest EmergencyNumberTrackerTest
Bug: 249107141
Change-Id: I9049595980b451d99e9a31c15cee75ccc8e1a6f5