net: cavium: use module_pci_driver to simplify the code

Use the module_pci_driver() macro to make the code simpler
by eliminating module_init and module_exit calls.
Signed-off-by: NWei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/cavium/common/cavium_ptp.c

@@ -336,18 +336,7 @@ static struct pci_driver cavium_ptp_driver = {
 	.remove = cavium_ptp_remove,
 };
 
-static int __init cavium_ptp_init_module(void)
-{
-	return pci_register_driver(&cavium_ptp_driver);
-}
-
-static void __exit cavium_ptp_cleanup_module(void)
-{
-	pci_unregister_driver(&cavium_ptp_driver);
-}
-
-module_init(cavium_ptp_init_module);
-module_exit(cavium_ptp_cleanup_module);
+module_pci_driver(cavium_ptp_driver);
 
 MODULE_DESCRIPTION(DRV_NAME);
 MODULE_AUTHOR("Cavium Networks <support@cavium.com>");