QuickSettings : Don't allow duplicate tiles

Don't allow user to add duplicate quick settings tiles

Change-Id: I7614fce2b5ffa0070c834b5de14b039c7b768b9f
Merge "QuickSettings : Don't allow duplicate tiles" into cm-10.2
Settings: Enable up navigation for Status and legal info

Change-Id: I7f5fd4d29565a704722af6b754e8e56c1f697c85
Merge remote-tracking branch 'cm/cm-10.2' into cm-10.2