[MTD] [NAND] OMAP2: remove duplicated #include

Removed duplicated #include <asm/arch/gpmc.h> in
drivers/mtd/onenand/omap2.c.
Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/onenand/omap2.c

@@ -38,7 +38,6 @@
 #include <asm/arch/gpmc.h>
 #include <asm/arch/onenand.h>
 #include <asm/arch/gpio.h>
-#include <asm/arch/gpmc.h>
 #include <asm/arch/pm.h>
 
 #include <linux/dma-mapping.h>