Fix data call retry issue for RAT change

If there is a data RAT change when current data
connection is in Retry state, the RAT change event
will transition data connection to Inactive state.
Due to this, though data is enabled, there will not
be any data connection.

Add a check for service state while processing RAT
change event in Retry state.

Change-Id: Id2234c7efcccbeb034ac72dea31be433e6827131
CRs-Fixed: 623323, 677120