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Consolidated all data allow/disallow logic into one method
Consolidated all data allow/disallow logic into one method and got rid of the obsolete isDataPossible. This is the preliminary work for checking if data is allowed just right before data connection entering connected state. Test: Telephony sanity tests and unit tests bug: 33847610 Change-Id: I24f1415bbb59990e9e8e9920724be9e3f17e3e60