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-onenand.c b/arch/arm/mach-omap2/gpmc-onenand.c
index f318f11..d102183 100644
--- a/arch/arm/mach-omap2/gpmc-onenand.c
+++ b/arch/arm/mach-omap2/gpmc-onenand.c
@@ -20,8 +20,7 @@
 
 #include <asm/mach/flash.h>
 
-#include <plat/gpmc.h>
-
+#include "gpmc.h"
 #include "soc.h"
 #include "gpmc-onenand.h"