drivers/power: Add module.h to the actual modules in drivers/power

The module.h header is no longer going to be implicitly present
everywhere.  So real modular users need to call out its use
explicitly in advance.

[v2: add new users reported by Randy Dunlap <rdunlap@xenotime.net>]

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/drivers/power/max8998_charger.c b/drivers/power/max8998_charger.c
index ef8efad..93e3bb4 100644
--- a/drivers/power/max8998_charger.c
+++ b/drivers/power/max8998_charger.c
@@ -19,6 +19,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#include <linux/module.h>
 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/slab.h>