appops: Add support for SU

This patch adds support for superuser app-ops control. The end-goal
is to better prepare superuser for the multi-user experience while
also replacing the superuser app with existing components.

Change-Id: I52acf98a39f18f12a23f4f902a39ae3f7c5b4895

Conflicts:
	core/res/res/values/cm_strings.xml
	core/res/res/values/slim_arrays.xml
su: Add an indicator when a 'su' session is active

This adds an indicator to the statusbar that is visible whenever a root
session is active, akin to the fine location icon.

Change-Id: I669fcc87e2b7a3201308170d7727ec5fb0e00e2b

Conflicts:
	packages/SystemUI/res/values/cm_strings.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
	services/core/java/com/android/server/AppOpsService.java