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: Ib152f97711441fded998a36528ef007f9e28ccbf
Change-Id: Ib152f97711441fded998a36528ef007f9e28ccbf
(cherry picked from commit 05a65432)