bullhead/sepolicy: allow system_server to search mpctl_data_file

avc: denied { search } for pid=5800 comm="InputDispatcher" name="perfd" dev="dm-2" ino=408832 scontext=u:r:system_server:s0 tcontext=u:object_r:mpctl_data_file:s0 tclass=dir

Bug: 22840355
Change-Id: I8b018cf5c64bcb9eea121243d2aead79e3ec3f93
diff --git a/sepolicy/system_server.te b/sepolicy/system_server.te
index 130f0bf..94741f3 100644
--- a/sepolicy/system_server.te
+++ b/sepolicy/system_server.te
@@ -22,5 +22,7 @@
 allow system_server location_data_file: { fifo_file sock_file } { create_file_perms };
 allow system_server location_data_file:dir rw_dir_perms;
 
+allow system_server mpctl_data_file:dir search;
+
 # talk to perfd
 unix_socket_connect(system_server, mpctl, perfd)