Cleaned up the phone type check

Phone type can only be GSM now after CDMA code removed. So
removing all isPhoneTypeXxx checks.

Also removed some dead codes.

BYPASS_LARGE_CHANGE_WARNING
Bug: 423974654
Test: Basic telephony functionality tests
Flag: EXEMPT dead code removal

Change-Id: I9195c7f394c4742a3ce26caf763f9fbc862afaea