pinctrl: imx8qm: Support building as module

Change configuration to "tristate", add module device table,
author, description and license to support building i.MX8QM
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/1592979844-18833-9-git-send-email-Anson.Huang@nxp.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/freescale/Kconfig

@@ -152,7 +152,7 @@ config PINCTRL_IMX8MQ
 	  Say Y here to enable the imx8mq pinctrl driver
 
 config PINCTRL_IMX8QM
-	bool "IMX8QM pinctrl driver"
+	tristate "IMX8QM pinctrl driver"
 	depends on IMX_SCU && ARCH_MXC && ARM64
 	select PINCTRL_IMX_SCU
 	help

drivers/pinctrl/freescale/pinctrl-imx8qm.c

@@ -298,6 +298,7 @@ static const struct of_device_id imx8qm_pinctrl_of_match[] = {
 	{ .compatible = "fsl,imx8qm-iomuxc", },
 	{ /* sentinel */ }
 };
+MODULE_DEVICE_TABLE(of, imx8qm_pinctrl_of_match);
 
 static int imx8qm_pinctrl_probe(struct platform_device *pdev)
 {
@@ -324,3 +325,7 @@ static int __init imx8qm_pinctrl_init(void)
 	return platform_driver_register(&imx8qm_pinctrl_driver);
 }
 arch_initcall(imx8qm_pinctrl_init);
+
+MODULE_AUTHOR("Aisheng Dong <aisheng.dong@nxp.com>");
+MODULE_DESCRIPTION("NXP i.MX8QM pinctrl driver");
+MODULE_LICENSE("GPL v2");