Revert "Remove SELinux additions from public API"

This reverts commit f02a38728bc887a111f2dee559ca87347f8f0153.

Conflicts:
	core/java/android/app/admin/DeviceAdminInfo.java
	core/java/android/app/admin/DevicePolicyManager.java

Change-Id: I6b2963bf442e844dcbc96a4caf8b5c88476bdfac