Update year in copyright text to 2014

Change-Id: Ic7fb61aabae1d515b9e6baf3dd003807ff42da60
diff --git a/bl31/bl31.mk b/bl31/bl31.mk
index 4aed11b..3448623 100644
--- a/bl31/bl31.mk
+++ b/bl31/bl31.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met: