ppp.te: Remove allow ppp toolbox_exec:file rx_file_perms;

auditallow says no denials.

Change-Id: Ib4e38f5393d3f3ba67277017abc848f5e7c04efd

ppp.te

@@ -11,9 +11,6 @@ allow ppp mtp:unix_dgram_socket rw_socket_perms;
 allow ppp ppp_device:chr_file rw_file_perms;
 allow ppp self:capability net_admin;
 allow ppp system_file:file rx_file_perms;
-# XXX Run toolbox.  Might not be needed.
-allow ppp toolbox_exec:file rx_file_perms;
-auditallow ppp toolbox_exec:file rx_file_perms;
 allow ppp vpn_data_file:dir w_dir_perms;
 allow ppp vpn_data_file:file create_file_perms;
 allow ppp mtp:fd use;