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>

drivers/power/s3c_adc_battery.c

@@ -421,17 +421,7 @@ static struct platform_driver s3c_adc_bat_driver = {
 	.resume		= s3c_adc_bat_resume,
 };
 
-static int __init s3c_adc_bat_init(void)
-{
-	return platform_driver_register(&s3c_adc_bat_driver);
-}
-module_init(s3c_adc_bat_init);
-
-static void __exit s3c_adc_bat_exit(void)
-{
-	platform_driver_unregister(&s3c_adc_bat_driver);
-}
-module_exit(s3c_adc_bat_exit);
+module_platform_driver(s3c_adc_bat_driver);
 
 MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
 MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");