Renamed voiceNetworkStateChanged and dataNetworkStateChanged

The misleading voiceNetworkStateChanged should be renamed
to networkStateChanged to reflect either voice or data
network changes will trigger this indication.
And dataNetworkStateChanged should be renamed to
dataCallListChanged as well.

Test: Build
Merged-In: Icf20ceb3718794f7aa62650816714ac8679d101a
Change-Id: Icf20ceb3718794f7aa62650816714ac8679d101a