SystemUI: Add Expanded desktop tile to QuickSettings (2/2)

    * Patch Set 1: initial commit
    * Patch Set 2: change tile title
    * Patch Set 3: change tile title again
    * Patch Set 4: updated to suggested drawable by blunden
    * Patch Set 5: update drawables to fit to the bahavior of
                   the other icons used in QS

Change-Id: I2273f8f0bdb726ec34f00a6fb205b1bc6e795cfa