Statusbar(MSIM): Do not display data icon if data is not connected.

When updating the status bar for the WiFi connected status, even if
the mobile data state is in disconnected state, it shows data icon
based on the data network type.
Add code to check if mobile data connected while updating data icon.

Change-Id: I35e80f5073ba24ebbebc354a2b30c62bf660b809
CRs-Fixed: 584106