Policy for using Apex sepolicy

Bug: 199914227
Test: aosp/1910032
Change-Id: I0726facbf0c28c486ef6501718a6013a040e4b0e
diff --git a/private/file.te b/private/file.te
index f3e1855..0eb2018 100644
--- a/private/file.te
+++ b/private/file.te
@@ -77,3 +77,7 @@
 
 # /metadata/sepolicy
 type sepolicy_metadata_file, file_type;
+
+# /dev/selinux/test - used to verify that apex sepolicy is loaded and
+# property labeled.
+type sepolicy_test_file, file_type;