SystemUI: add permission to kill apps

Change-Id: Icebada693b137a7cb46493a687a17a6240469674
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>
Query location of Clear All Recents only if there are apps

Change-Id: Ifd91e8a14d5f7eaaa05bc4958820b97ac6bf2e9c
Signed-off-by: Alexander Martinz <eviscerationls@gmail.com>