power_supply: Convert drivers/power/* to use module_platform_driver()

This patch converts the drivers in drivers/power/* to use the
module_platform_driver() macro which makes the code smaller and a bit
simpler.

Cc: Mike Rapoport <mike@compulab.co.il>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Nithish Mahalingam <nithish.mahalingam@intel.com>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Haojian Zhuang <haojian.zhuang@marvell.com>
Cc: Balaji Rao <balajirrao@openmoko.org>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Clifton Barnes <cabarnes@indesign-llc.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
diff --git a/drivers/power/isp1704_charger.c b/drivers/power/isp1704_charger.c
index f6d72b4..6a4ef38 100644
--- a/drivers/power/isp1704_charger.c
+++ b/drivers/power/isp1704_charger.c
@@ -494,17 +494,7 @@
 	.remove = __devexit_p(isp1704_charger_remove),
 };
 
-static int __init isp1704_charger_init(void)
-{
-	return platform_driver_register(&isp1704_charger_driver);
-}
-module_init(isp1704_charger_init);
-
-static void __exit isp1704_charger_exit(void)
-{
-	platform_driver_unregister(&isp1704_charger_driver);
-}
-module_exit(isp1704_charger_exit);
+module_platform_driver(isp1704_charger_driver);
 
 MODULE_ALIAS("platform:isp1704_charger");
 MODULE_AUTHOR("Nokia Corporation");