SystemUI: Add four switches in quick settings

Roaming switch: add global roaming switch in quick settings.
Data switch: support to turn data on/off from quick settings.
APN switch: Add an switch into quick setting view to select APN.
Dds switch: Switch data sub when clicking the shortcut no matter
mobile data is on or off.

Conflicts:
        packages/SystemUI/res/values/config.xml

Change-Id: I2ffb635a9d1f46aa82cc216b545205b2e891a020