ARM: OMAP2+: gpmc: localize gpmc header

Requirement of gpmc header outside of mach-omap2 has been
cutoff, move gpmc header file in plat-omap folder to local
mach-omap2 folder

Objective - common zImage participation of omap

Signed-off-by: Afzal Mohammed <afzal@ti.com>
diff --git a/arch/arm/mach-omap2/gpmc-nand.h b/arch/arm/mach-omap2/gpmc-nand.h
index 11a377f..d59e128 100644
--- a/arch/arm/mach-omap2/gpmc-nand.h
+++ b/arch/arm/mach-omap2/gpmc-nand.h
@@ -10,7 +10,7 @@
 #ifndef	__OMAP2_GPMC_NAND_H
 #define	__OMAP2_GPMC_NAND_H
 
-#include <plat/gpmc.h>
+#include "gpmc.h"
 #include <linux/platform_data/mtd-nand-omap2.h>
 
 #if IS_ENABLED(CONFIG_MTD_NAND_OMAP2)