Make sure only VS can access its data files

Bug: 237054515
Test: Builds
Change-Id: Id207bfc3639254e63b00e2a9ac9780ab83a013ff
diff --git a/private/virtualizationservice.te b/private/virtualizationservice.te
index c369a90..9ae5308 100644
--- a/private/virtualizationservice.te
+++ b/private/virtualizationservice.te
@@ -82,3 +82,9 @@
   -init
   -virtualizationservice
 } virtualizationservice_prop:property_service set;
+
+neverallow {
+  domain
+  -init
+  -virtualizationservice
+} virtualizationservice_data_file:file { open create };