mtd: Add module.h to drivers users that were implicitly using it.

We are cleaning up the implicit presence of module.h that these
drivers are taking advantage of.  Fix them in advance of the
cleanup operation.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/drivers/mtd/nand/cmx270_nand.c b/drivers/mtd/nand/cmx270_nand.c
index 6fc043a..be33b0f 100644
--- a/drivers/mtd/nand/cmx270_nand.c
+++ b/drivers/mtd/nand/cmx270_nand.c
@@ -22,6 +22,7 @@
 #include <linux/mtd/partitions.h>
 #include <linux/slab.h>
 #include <linux/gpio.h>
+#include <linux/module.h>
 
 #include <asm/io.h>
 #include <asm/irq.h>