rild: Remove toolbox_exec perms

Confirmed via audit logs that it is not required.

Change-Id: I01d4b7ec15d4c852a9f28daf0b40ab4bce930125
diff --git a/rild.te b/rild.te
index bcf31d6..1183d4c 100644
--- a/rild.te
+++ b/rild.te
@@ -23,9 +23,6 @@
 allow rild system_data_file:dir r_dir_perms;
 allow rild system_data_file:file r_file_perms;
 allow rild system_file:file x_file_perms;
-# XXX Run toolbox.  Might not be needed.
-allow rild toolbox_exec:file rx_file_perms;
-auditallow rild toolbox_exec:file rx_file_perms;
 
 # property service
 set_prop(rild, radio_prop)