[MTD] Provide mtdram.h with mtdram_init_device() prototype

This is used by axisflashmap.c to boot from ram.
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Mikael Starvik <starvik@axis.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

include/linux/mtd/mtdram.h

+#ifndef __MTD_MTDRAM_H__
+#define __MTD_MTDRAM_H__
+
+#include <linux/mtd/mtd.h>
+int mtdram_init_device(struct mtd_info *mtd, void *mapped_address,
+                       unsigned long size, char *name);
+
+#endif /* __MTD_MTDRAM_H__ */