add app blocking api

- launches CarAppBlockingPolicyService and read Policy on startup
- also provides setAppBlockingPolicy API
- not working fully due to missng framework api but only sets internal
  state for now.
- also fixed some build warnings
- also renamed all permisisons to android.support.car
- remaining TODO:
  monitor app install / uninstall and re-activate policy
  plumb framework side policy setting

bug: 25261583

Change-Id: I6da09468c95a28f2e3d7d59e6e91279ca018239b
diff --git a/service/src/com/android/car/ICarImpl.java b/service/src/com/android/car/ICarImpl.java
index abea6f7..6a478ed 100644
--- a/service/src/com/android/car/ICarImpl.java
+++ b/service/src/com/android/car/ICarImpl.java
@@ -29,6 +29,7 @@
 
 import com.android.car.CarSystem;
 import com.android.car.hal.VehicleHal;
+import com.android.car.pm.CarPackageManagerService;
 import com.android.internal.annotations.GuardedBy;
 
 import java.io.PrintWriter;