clk: tegra: dfll: 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: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/tegra/clk-tegra124-dfll-fcpu.c

@@ -163,9 +163,4 @@ static struct platform_driver tegra124_dfll_fcpu_driver = {
 		.pm = &tegra124_dfll_pm_ops,
 	},
 };
-
-static int __init tegra124_dfll_fcpu_init(void)
-{
-	return platform_driver_register(&tegra124_dfll_fcpu_driver);
-}
-device_initcall(tegra124_dfll_fcpu_init);
+builtin_platform_driver(tegra124_dfll_fcpu_driver);