setup-ubl: Add note that this file is no longer actively used

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I70cae180c1d65f60078fa688f6d19f4d1e1f25ca
diff --git a/setup-ubl b/setup-ubl
index 51deb3e..440154b 100755
--- a/setup-ubl
+++ b/setup-ubl
@@ -1,4 +1,8 @@
 #!/bin/sh
+#
+# NOTE: This file is no longer used, license importing is now handled
+# on TuxSuite side. This file is left around for reference.
+#
 set -ex
 
 ARMLM=$(find /opt/model/ -name armlm)