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: telephony sanity test
Merged-In: I5839efc3bdaf137310238790221c8ba93794bde3
Change-Id: I5839efc3bdaf137310238790221c8ba93794bde3