ManageStoragePreferenceController: Explicitly disable storage management preference

broken and shows empty space

Change-Id: I2e9ab26c5a1c92a812f86253809664ae67a2973a

src/com/android/settings/deviceinfo/storage/ManageStoragePreferenceController.java

@@ -53,7 +53,7 @@ public class ManageStoragePreferenceController extends BasePreferenceController
 
     @Override
     public int getAvailabilityStatus() {
-        return mManageStorageDrawable == null ? CONDITIONALLY_UNAVAILABLE : AVAILABLE;
+        return UNSUPPORTED_ON_DEVICE;
     }
 
     @Override