power: reset: axxia-reset: use builtin_platform_driver() to simplify code

The axxia_reset_init() doesn't do anything special, so it can use the
builtin_platform_driver() macro to eliminate boilerplate code.
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20230807131951.3443880-5-yangyingliang@huawei.comSigned-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/reset/axxia-reset.c

@@ -80,9 +80,4 @@ static struct platform_driver axxia_reset_driver = {
 		.of_match_table = of_match_ptr(of_axxia_reset_match),
 	},
 };
-
-static int __init axxia_reset_init(void)
-{
-	return platform_driver_register(&axxia_reset_driver);
-}
-device_initcall(axxia_reset_init);
+builtin_platform_driver(axxia_reset_driver);