NotificationHelper: Define Peek app broadcast intents

Continue this https://gerrit.paranoidandroid.co/#/c/4369/

Change-Id: I20a66dcb133a0ca50e233bbd1874032bec1f4258
Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Merge "NotificationHelper: Define Peek app broadcast intents" into kitkat