Fixed network name for about/sim_status

The network name in sim status dialog is not the same as the one in the
about page. This CL use the carrier text which is resolved in
ServiceStateTracker as the network name, this keep the network name sync
with the status bar and the summary of sim status in the about page.

Bug: 31784938
Test: build & manual test
Change-Id: Ia741baabaa98ae447dbedf9e28fd2fda222e6d2e