mtd: orion: Cleanup mtd-orion_nand.h header

Commit c02cecb9 ("ARM: orion: move platform_data definitions")
moved the file to the current location but forgot to remove the pointer
to its previous location. Clean it up. While at it also change the header
file protection macros appropriately.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

include/linux/platform_data/mtd-orion_nand.h

 /*
- * arch/arm/plat-orion/include/plat/orion_nand.h
- *
  * This file is licensed under the terms of the GNU General Public
  * License version 2.  This program is licensed "as is" without any
  * warranty of any kind, whether express or implied.
  */
 
-#ifndef __PLAT_ORION_NAND_H
-#define __PLAT_ORION_NAND_H
+#ifndef __MTD_ORION_NAND_H
+#define __MTD_ORION_NAND_H
 
 /*
  * Device bus NAND private data