Correctly support LTE carrier aggregation

NetworkRegistrationInfo.getAccessNetworkTechnology() should
report LTE as the network type when modem reports the RAT
LTE_CA. Fixed by adding a flag in data specific registration
info.

Test: Manual
Bug: 129707180
Merged-In: I92b37c17c92b127c7d3729b266be3989b2f2e810
Change-Id: I92b37c17c92b127c7d3729b266be3989b2f2e810
(cherry picked from commit 6c9777b2)