pinctrl: imx8qxp: Support building as module

Change configuration to "tristate", add module device table,
author, description and license to support building i.MX8QXP
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/1592979844-18833-8-git-send-email-Anson.Huang@nxp.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/freescale/Kconfig

@@ -159,7 +159,7 @@ config PINCTRL_IMX8QM
 	  Say Y here to enable the imx8qm pinctrl driver
 
 config PINCTRL_IMX8QXP
-	bool "IMX8QXP pinctrl driver"
+	tristate "IMX8QXP pinctrl driver"
 	depends on IMX_SCU && ARCH_MXC && ARM64
 	select PINCTRL_IMX_SCU
 	help

drivers/pinctrl/freescale/pinctrl-imx8qxp.c

@@ -204,6 +204,7 @@ static const struct of_device_id imx8qxp_pinctrl_of_match[] = {
 	{ .compatible = "fsl,imx8qxp-iomuxc", },
 	{ /* sentinel */ }
 };
+MODULE_DEVICE_TABLE(of, imx8qxp_pinctrl_of_match);
 
 static int imx8qxp_pinctrl_probe(struct platform_device *pdev)
 {
@@ -230,3 +231,7 @@ static int __init imx8qxp_pinctrl_init(void)
 	return platform_driver_register(&imx8qxp_pinctrl_driver);
 }
 arch_initcall(imx8qxp_pinctrl_init);
+
+MODULE_AUTHOR("Aisheng Dong <aisheng.dong@nxp.com>");
+MODULE_DESCRIPTION("NXP i.MX8QXP pinctrl driver");
+MODULE_LICENSE("GPL v2");