firmware: imx: scu: change init level to subsys_initcall_sync

Change firmware init level to subsys_initcall_sync to ensure it's
probed before most devices to avoid unnecessary defer probe.
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

drivers/firmware/imx/imx-scu.c

@@ -353,7 +353,12 @@ static struct platform_driver imx_scu_driver = {
 	},
 	.probe = imx_scu_probe,
 };
-builtin_platform_driver(imx_scu_driver);
+
+static int __init imx_scu_driver_init(void)
+{
+	return platform_driver_register(&imx_scu_driver);
+}
+subsys_initcall_sync(imx_scu_driver_init);
 
 MODULE_AUTHOR("Dong Aisheng <aisheng.dong@nxp.com>");
 MODULE_DESCRIPTION("IMX SCU firmware protocol driver");