Added CommandsInterface.registerForRilConnected which allows components
to register for when the ril connects and provides the version of the
ril to the registrants or a -1 if the ril disconnects.
For ril version 6 RIL.setupDataCall needs to have RadioTechnology + 2
as the radioTechnology parameter when the rilVersion is >= 6.
DataConnection then uses registersForRilConnected to get the ril
version and provide the proper radioTechnology value to
RIL.setupDataCall
Change-Id: Iacba764b9e38a4a138d186ccf1625fea760cc56d
1dd2ada5cf