Change CARRIER_SETUP hook in ConnectivityService to use Aeroshell API

for determining carrier app instead of MCC/MNC.

Related ConnectivityService change: http://ag/374479

Related Aeroshell change to SetupWizard: http://ag/520857

Bug: 16457806
Change-Id: I78eb2a25d578400c2de6bae4af3d6e8e1ee4d0c7