ds2781_battery: Convert to module_platform_driver

module_platform_driver can be used to replace the platform_driver
register and unregister functions, with the calls to module_init
and module_exit,

i.e. all the code that is doing like the below

static int __init mymod_init(void)
{
	return platform_driver_register(&drv_operations);
}

static void __exit mymod_exit(void)
{
	platform_driver_unregister(&drv_operations);
}

module_init(mymod_init);
module_exit(mymod_exit);

can be replaced with
module_platform_driver(drv_operations)...
Signed-off-by: Devendra Naga <develkernel412222@gmail.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>

drivers/power/ds2781_battery.c

@@ -834,20 +834,7 @@ static struct platform_driver ds2781_battery_driver = {
 	.probe	  = ds2781_battery_probe,
 	.remove   = __devexit_p(ds2781_battery_remove),
 };
-
-static int __init ds2781_battery_init(void)
-{
-	return platform_driver_register(&ds2781_battery_driver);
-}
-
-static void __exit ds2781_battery_exit(void)
-{
-	platform_driver_unregister(&ds2781_battery_driver);
-}
-
-module_init(ds2781_battery_init);
-module_exit(ds2781_battery_exit);
-
+module_platform_driver(ds2781_battery_driver);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");