[gatekeeperd] allow calls to UserManagerService

Bug: 22257554
Change-Id: Ifaf36930bf301708c196f7bd0530abe82c1e0b50

gatekeeperd.te

@@ -17,6 +17,8 @@ allow gatekeeperd keystore:keystore_key { add_auth };
 # For permissions checking
 allow gatekeeperd system_server:binder call;
 allow gatekeeperd permission_service:service_manager find;
+# For parent user ID lookup
+allow gatekeeperd user_service:service_manager find;
 
 # for SID file access
 allow gatekeeperd gatekeeper_data_file:dir rw_dir_perms;