Report data status from ApnContext even if data is detached

While in HO, data connection type may temporary become "unknown".
This triggers TelephonyRegistry picks up the wrong data connection
state, ending up notifying bogus state to ConnectivityService.

The patch is just to pick up the status from ApnContext which
should be maintaining the right state. Also cleaned up unnecessary
lines which was added earlier phase.

Change-Id: I07e74ce55f09ad31f2d8d09e2a144dc0b600eb0c