leds: leds-cobalt-raq: use builtin_platform_driver

Use builtin_platform_driver() helper to simplify the code.
Signed-off-by: NGeliang Tang <geliangtang@gmail.com>
Signed-off-by: NJacek Anaszewski <j.anaszewski@samsung.com>

drivers/leds/leds-cobalt-raq.c

@@ -115,8 +115,4 @@ static struct platform_driver cobalt_raq_led_driver = {
 	},
 };
 
-static int __init cobalt_raq_led_init(void)
-{
-	return platform_driver_register(&cobalt_raq_led_driver);
-}
-device_initcall(cobalt_raq_led_init);
+builtin_platform_driver(cobalt_raq_led_driver);