Suppress mobile-out-of-service label if wifi connected.

Carrier name is shown if
 - in service and connected to mobile data
 - in service and connected to wifi

Carrier name is blanked if out of service and connected to
wifi.

"No internet connection" is shown if out of service without
any other route.

Bug: 5903914
Change-Id: I59d4d0c90e4153d73c38f7f0e150becf7e021a5b