We were not keeping track when an app that set an app op restriction dies to clean up after that. As a result we may end up with stale restrictions that will be there until the device reoots - not cool. This change adds remote binder death tracking and simplifies the code as adding the formed would have made more complex. bug:28770536 Change-Id: I7dcaafba2354843a0cdf0206ab1f96625edc5120