Add permission that allows cancelling notifications from other apps.

Change-Id: I055b17873e174f71174898a7649b1e221fd8c436
Signed-off-by: Evan Anderson <evan1124@gmail.com>

Conflicts:
	core/res/res/values/cm_strings.xml
Notification cancellation fixes:
Permission should only allow cancellation of other app notifications, not enqueueing.
Fix checkapi breakage.

Change-Id: Idbcfd4617057984250dc4d4fa32ff55bfbb155e2
Merge branch 'exp' into jellybean