Add selinux policies for superuser

Change-Id: I878eaa9d25feaedf46e89083f91d6a21f4aff37a
diff --git a/sepolicy/sepolicy.mk b/sepolicy/sepolicy.mk
index 5493b76..309d13c 100644
--- a/sepolicy/sepolicy.mk
+++ b/sepolicy/sepolicy.mk
@@ -15,6 +15,7 @@
     auditd.te \
     installd.te \
     netd.te \
+    su.te \
     sysinit.te \
     system.te \
     ueventd.te \