soc: mediatek: mtk-mmsys: Use module_platform_driver() macro

Instead of open-coding init/exit calls, switch to using the
module_platform_driver() macro instead, doing the exact same.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://lore.kernel.org/r/20230222094253.23678-3-angelogioacchino.delregno@collabora.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

Author: AngeloGioacchino Del Regno

drivers/soc/mediatek/mtk-mmsys.c

@@ -491,19 +491,7 @@ static struct platform_driver mtk_mmsys_drv = {
 	.probe = mtk_mmsys_probe,
 	.remove = mtk_mmsys_remove,
 };
-
-static int __init mtk_mmsys_init(void)
-{
-	return platform_driver_register(&mtk_mmsys_drv);
-}
-
-static void __exit mtk_mmsys_exit(void)
-{
-	platform_driver_unregister(&mtk_mmsys_drv);
-}
-
-module_init(mtk_mmsys_init);
-module_exit(mtk_mmsys_exit);
+module_platform_driver(mtk_mmsys_drv);
 
 MODULE_AUTHOR("Yongqiang Niu <yongqiang.niu@mediatek.com>");
 MODULE_DESCRIPTION("MediaTek SoC MMSYS driver");