wan/fsl_ucc_hdlc: use module_platform_driver to simplify the code

module_platform_driver() makes the code simpler by eliminating
boilerplate code.
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/wan/fsl_ucc_hdlc.c

@@ -1174,15 +1174,4 @@ static struct platform_driver ucc_hdlc_driver = {
 	},
 };
 
-static int __init ucc_hdlc_init(void)
-{
-	return platform_driver_register(&ucc_hdlc_driver);
-}
-
-static void __exit ucc_hdlc_exit(void)
-{
-	platform_driver_unregister(&ucc_hdlc_driver);
-}
-
-module_init(ucc_hdlc_init);
-module_exit(ucc_hdlc_exit);
+module_platform_driver(ucc_hdlc_driver);