Allow ueventd to relabel sysfs nodes.

Required for If8b8d66120453123c1371ce063b6f20e8b96b6ef .

Change-Id: I98871b957db8b291cbbb827b5eb39b4279ce4194
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

ueventd.te

@@ -10,6 +10,7 @@ allow ueventd device:file create_file_perms;
 allow ueventd device:chr_file rw_file_perms;
 allow ueventd sysfs:file rw_file_perms;
 allow ueventd sysfs:file setattr;
+allow ueventd sysfs_type:file { relabelfrom relabelto };
 allow ueventd tmpfs:chr_file rw_file_perms;
 allow ueventd dev_type:dir create_dir_perms;
 allow ueventd dev_type:lnk_file { create unlink };