[MTD] Make functions static, include header files with prototypes

This patch contains the following possible cleanups:
- every file should #include the headers containing the prototypes for
  it's global functions
- make needlessly global functions static

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/mtd/nand/nandsim.c

@@ -1486,7 +1486,7 @@ ns_nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
 /*
  * Module initialization function
  */
-int __init ns_init_module(void)
+static int __init ns_init_module(void)
 {
 	struct nand_chip *chip;
 	struct nandsim *nand;