PCI: altera: Use builtin_platform_driver() to simplify the code

Use the builtin_platform_driver() macro to make the code simpler.
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/host/pcie-altera.c

@@ -641,8 +641,4 @@ static struct platform_driver altera_pcie_driver = {
 	},
 };
 
-static int altera_pcie_init(void)
-{
-	return platform_driver_register(&altera_pcie_driver);
-}
-device_initcall(altera_pcie_init);
+builtin_platform_driver(altera_pcie_driver);