max8997_charger: Needs module.h

power/max8997_charger.c uses interfaces from linux/module.h,
so it should include that file.  This fixes build errors.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
diff --git a/drivers/power/max8997_charger.c b/drivers/power/max8997_charger.c
index 7106b49..ffc5033 100644
--- a/drivers/power/max8997_charger.c
+++ b/drivers/power/max8997_charger.c
@@ -20,6 +20,7 @@
  */
 
 #include <linux/err.h>
+#include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>