surfaceflinger: remove unconfined domain reference.

surfaceflinger has been enforcing for a while now. Remove
the reference to the unconfined domain.

Change-Id: Ia86a0553e9c2db3c89f93e26179c79278d1d3bed

surfaceflinger.te

@@ -64,5 +64,4 @@ allow surfaceflinger tee_device:chr_file rw_file_perms;
 
 # Do not allow accessing SDcard files as unsafe ejection could
 # cause the kernel to kill the process.
-# TODO: Remove -unconfineddomain when we remove permissive_or_unconfined above.
-neverallow { surfaceflinger -unconfineddomain } sdcard_type:file rw_file_perms;
+neverallow surfaceflinger sdcard_type:file rw_file_perms;