sepolicy: broaden system_server access to foreign_dex_data_file{dir}.

The system_server needs to clear these markers along with other app
data that it's responsible for clearing.

bug: 28510916
Change-Id: If9ba8b5b372cccefffd03ffddc51acac8e0b4649

system_server.te

@@ -15,8 +15,8 @@ allow system_server dalvikcache_data_file:dir r_dir_perms;
 # We need search on top level directories so that we can get to the files
 allow system_server user_profile_data_file:dir search;
 allow system_server user_profile_data_file:file getattr;
-allow system_server user_profile_foreign_dex_data_file:dir search;
-allow system_server user_profile_foreign_dex_data_file:file getattr;
+allow system_server user_profile_foreign_dex_data_file:dir { open read write search remove_name };
+allow system_server user_profile_foreign_dex_data_file:file { getattr unlink };
 
 # /data/resource-cache
 allow system_server resourcecache_data_file:file r_file_perms;