Remove write access to system_data_file from rild.

Anything writable by rild should be in radio_data_file or efs_file.
System data should be read-only.

Change-Id: I442a253c22f567a147d0591d623e97a6ee8b76e3
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

rild.te

@@ -21,10 +21,8 @@ allow rild bluetooth_efs_file:dir r_dir_perms;
 allow rild radio_data_file:dir rw_dir_perms;
 allow rild radio_data_file:file create_file_perms;
 allow rild sdcard_type:dir r_dir_perms;
-allow rild system_data_file:dir create_dir_perms;
-allow rild system_data_file:file create_file_perms;
-auditallow rild system_data_file:dir { create reparent rmdir setattr write add_name remove_name };
-auditallow rild system_data_file:file { create setattr write append link unlink rename };
+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;
 dontaudit rild self:capability sys_admin;