sysfs: add copyrights

Sysfs has gone through considerable amount of reimplementation.  Add
copyrights.  Any objections?  :-)

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index db5dd24..149ab62 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -3,6 +3,8 @@
  *
  * Copyright (c) 2001,2002 Patrick Mochel
  * Copyright (c) 2004 Silicon Graphics, Inc.
+ * Copyright (c) 2007 SUSE Linux Products GmbH
+ * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
  *
  * Please see Documentation/filesystems/sysfs.txt for more information.
  */