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/max17042_battery.c b/drivers/power/max17042_battery.c
index 98bfab3..9f0183c 100644
--- a/drivers/power/max17042_battery.c
+++ b/drivers/power/max17042_battery.c
@@ -23,6 +23,7 @@
  */
 
 #include <linux/init.h>
+#include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
 #include <linux/mod_devicetable.h>