Blackfin arch: update header to match new location

Signed-off-by: NGraf Yang <graf.yang@analog.com>
Signed-off-by: NBryan Wu <cooloney@kernel.org>

arch/blackfin/include/asm/reboot.h

 /*
- * include/asm-blackfin/reboot.h - shutdown/reboot header
+ * reboot.h - shutdown/reboot header
  *
- * Copyright 2004-2007 Analog Devices Inc.
+ * Copyright 2004-2008 Analog Devices Inc.
  *
  * Licensed under the GPL-2 or later.
  */