ARM: OMAP2+: nand: header cleanup

For common arm zImage existing nand header file
in platform specific location was moved to generic
platform data location, but it contained more than
platform data, remove it. New local header has been
created for exposing functions.

Also move gpmc-nand platform data to platform header
meant for nand from gpmc header file

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
new file mode 100644
index 0000000..11a377f
--- /dev/null
+++ b/arch/arm/mach-omap2/gpmc-nand.h
@@ -0,0 +1,27 @@
+/*
+ *  arch/arm/mach-omap2/gpmc-nand.h
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ */
+
+#ifndef	__OMAP2_GPMC_NAND_H
+#define	__OMAP2_GPMC_NAND_H
+
+#include <plat/gpmc.h>
+#include <linux/platform_data/mtd-nand-omap2.h>
+
+#if IS_ENABLED(CONFIG_MTD_NAND_OMAP2)
+extern int gpmc_nand_init(struct omap_nand_platform_data *d,
+			  struct gpmc_timings *gpmc_t);
+#else
+static inline int gpmc_nand_init(struct omap_nand_platform_data *d,
+				 struct gpmc_timings *gpmc_t)
+{
+	return 0;
+}
+#endif
+
+#endif