pinctrl: imx8dxl: Support building as module

Change configuration to "tristate", add module device table,
author, description and license to support building i.MX8DXL
pinctrl driver as module.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Link: https://lore.kernel.org/r/1592979844-18833-10-git-send-email-Anson.Huang@nxp.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/freescale/Kconfig

@@ -166,7 +166,7 @@ config PINCTRL_IMX8QXP
 	  Say Y here to enable the imx8qxp pinctrl driver
 
 config PINCTRL_IMX8DXL
-	bool "IMX8DXL pinctrl driver"
+	tristate "IMX8DXL pinctrl driver"
 	depends on IMX_SCU && ARCH_MXC && ARM64
 	select PINCTRL_IMX_SCU
 	help

drivers/pinctrl/freescale/pinctrl-imx8dxl.c

@@ -165,6 +165,7 @@ static const struct of_device_id imx8dxl_pinctrl_of_match[] = {
 	{ .compatible = "fsl,imx8dxl-iomuxc", },
 	{ /* sentinel */ }
 };
+MODULE_DEVICE_TABLE(of, imx8dxl_pinctrl_of_match);
 
 static int imx8dxl_pinctrl_probe(struct platform_device *pdev)
 {
@@ -191,3 +192,7 @@ static int __init imx8dxl_pinctrl_init(void)
 	return platform_driver_register(&imx8dxl_pinctrl_driver);
 }
 arch_initcall(imx8dxl_pinctrl_init);
+
+MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
+MODULE_DESCRIPTION("NXP i.MX8DXL pinctrl driver");
+MODULE_LICENSE("GPL v2");