Revert "max8998_charger: Include linux/module.h just once"

This reverts commit 0c7b5558ecc0a508bb7199776afbf18279595539.

linux-next has the following patch:

- - - -
commit 13ae246d
Author: Paul Gortmaker <paul.gortmaker@windriver.com>
Date:   Sun Jan 29 15:44:45 2012 -0500

    includecheck: delete any duplicate instances of module.h
- - - -

It removes the other instance of include/module.h in this
driver, and so both gets removed. This makes max8998 driver
non-buildable.
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>

drivers/power/max8998_charger.c

@@ -21,6 +21,7 @@
 
 #include <linux/module.h>
 #include <linux/err.h>
+#include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>