Update getEmergencyNumberList() feature flag dependency

Given that  getEmergencyNumberList() functionality is utilized by both
calling and messaging modules, and messaging can be enabled without calling,
the function's access control should be based on FEATURE_TELEPHONY_CALLING
or FEATURE_TELEPHONY_MESSAGING.

Bug: 395178686
Flag: EXEMPT bug fix
Test: atest CtsTelephonyTestCases --no-bazel-mode
Change-Id: I8f33a5e58a7571dc9baa379efc4c1e7bcd3166ca