[ALPS04424802] Fix isEmergencyNumber issue

[Detail]
Before check emergency number, AOSP only strip separators.
It will encounter following issues:
1. Uri number is treat as emergency number
2. Post dial string (like: 112,1) is not treat as emergency number
which is a valid emergency number.

[Solution]
Add Uri number check and pre-process post dial string before
check emergency number which is the same as android P.

Bug: 188458699
Change-Id: If2bf06c1107e2d434b7ae1e44756577b65c8d097
CR-Id: ALPS04424802
Feature: Call Control Framework
(cherry picked from commit 92c9387b51d11df3e76d66e81dfa2fa9e849ddb6)