mtd: nand: omap: move omap_gpmc.h from arch/arm/include/asm to drivers/mtd/nand

omap_gpmc.h is a generic header used by OMAP NAND driver for all TI platfoms.
Hence this file should be present in generic folder instead of architecture
specific include folder.
Build tested using: ./MAKEALL -s am33xx -s omap3 -s omap4 -s omap5

Signed-off-by: Pekon Gupta <pekon@ti.com>
diff --git a/arch/arm/include/asm/arch-omap5/sys_proto.h b/arch/arm/include/asm/arch-omap5/sys_proto.h
index 4247473..9e007c8 100644
--- a/arch/arm/include/asm/arch-omap5/sys_proto.h
+++ b/arch/arm/include/asm/arch-omap5/sys_proto.h
@@ -12,7 +12,7 @@
 #include <asm/io.h>
 #include <asm/arch/clock.h>
 #include <asm/omap_common.h>
-#include <asm/omap_gpmc.h>
+#include <linux/mtd/omap_gpmc.h>
 #include <asm/arch/clock.h>
 
 DECLARE_GLOBAL_DATA_PTR;