pinctrl: madera: Add missing call to pinctrl_unregister_mappings

pinctrl_register_mappings is called in the pdata case, however a call to
pinctrl_unregister_mappings is missing causing the mappings to be leaked
on driver unbind. Add the missing call to correct this issue.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20200228154214.13916-1-ckeepax@opensource.cirrus.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/cirrus/pinctrl-madera-core.c

@@ -1073,13 +1073,26 @@ static int madera_pin_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	platform_set_drvdata(pdev, priv);
+
 	dev_dbg(priv->dev, "pinctrl probed ok\n");
 
 	return 0;
 }
 
+static int madera_pin_remove(struct platform_device *pdev)
+{
+	struct madera_pin_private *priv = platform_get_drvdata(pdev);
+
+	if (priv->madera->pdata.gpio_configs)
+		pinctrl_unregister_mappings(priv->madera->pdata.gpio_configs);
+
+	return 0;
+}
+
 static struct platform_driver madera_pin_driver = {
 	.probe = madera_pin_probe,
+	.remove = madera_pin_remove,
 	.driver = {
 		.name = "madera-pinctrl",
 	},