SystemUI: show network name on status bar pull down curtain

For SSSS mode, it shows "EMERGENCY CALL ONLY" on pull down
curtain and no carrier label shows. Per requirement from
carriers, it should show "No SIM card".

For DSDS mode, it shows sub information, like
"SUB1:XXX SUB2:XXX" and "NO INTERNET CONNECTION", operators
require not to show "NO INTERNET CONNECTION".

Change-Id: I6dae7ed381745da197364ed3d9390cdf76bc72fc

CRs-Fixed: 562620