drm/lima: use module_platform_driver helper

Simplify module init/exit with module_platform_driver.
Tested-by: NBhushan Shah <bshah@kde.org>
Reviewed-by: NVasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: NQiang Yu <yuq825@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200421133551.31481-2-yuq825@gmail.com

drivers/gpu/drm/lima/lima_drv.c

@@ -460,17 +460,7 @@ static struct platform_driver lima_platform_driver = {
 	},
 };
 
-static int __init lima_init(void)
-{
-	return platform_driver_register(&lima_platform_driver);
-}
-module_init(lima_init);
-
-static void __exit lima_exit(void)
-{
-	platform_driver_unregister(&lima_platform_driver);
-}
-module_exit(lima_exit);
+module_platform_driver(lima_platform_driver);
 
 MODULE_AUTHOR("Lima Project Developers");
 MODULE_DESCRIPTION("Lima DRM Driver");