avr32: fix build failures from mis-naming of atmel_nand.h

Commit bf4289cba02b ("ATMEL: fix nand ecc support") indicated that it
wanted to "Move platform data to a common header
include/linux/platform_data/atmel_nand.h" and the new header even had
re-include protectors with:

#ifndef __ATMEL_NAND_H__

However, the file that was added was simply called atmel.h
and this caused avr32 defconfig to fail with:

In file included from arch/avr32/boards/atstk1000/setup.c:22:
arch/avr32/mach-at32ap/include/mach/board.h:10:44: error: linux/platform_data/atmel_nand.h: No such file or directory
In file included from arch/avr32/boards/atstk1000/setup.c:22:
arch/avr32/mach-at32ap/include/mach/board.h:121: warning: 'struct atmel_nand_data' declared inside parameter list
arch/avr32/mach-at32ap/include/mach/board.h:121: warning: its scope is only this definition or declaration, which is probably not what you want
make[2]: *** [arch/avr32/boards/atstk1000/setup.o] Error 1

It seems the scope of the file contents will expand beyond
just nand, so ignore the original intention, and fix up the
users who reference the bad name with the _nand suffix.

CC: Jean-Christophe PLAGNIOL-VILLARD <[e-mail]>
CC: David Woodhouse <[e-mail]>
Acked-by: Hans-Christian Egtvedt <[e-mail]>
Signed-off-by: Paul Gortmaker <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/avr32/mach-at32ap/include/mach/board.h

···
 #include <linux/types.h>
 #include <linux/serial.h>
 #include <linux/platform_data/macb.h>
-#include <linux/platform_data/atmel_nand.h>
+#include <linux/platform_data/atmel.h>
 
 #define GPIO_PIN_NONE	(-1)
 

include/linux/platform_data/atmel.h

···
  * GPL v2 Only
  */
 
-#ifndef __ATMEL_NAND_H__
-#define __ATMEL_NAND_H__
+#ifndef __ATMEL_H__
+#define __ATMEL_H__
 
 #include <linux/mtd/nand.h>
 
···
 	unsigned int	num_parts;
 };
 
-#endif /* __ATMEL_NAND_H__ */
+#endif /* __ATMEL_H__ */