pinctrl: zynqmp: Drop pinctrl_unregister for devm_ registered device

It's not necessary to unregister pin controller device registered
with devm_pinctrl_register() and using pinctrl_unregister() leads
to a double free.

Fixes: fa99e70 ("pinctrl: zynqmp: some code cleanups")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20210729071905.3235953-1-yangyingliang@huawei.com

drivers/pinctrl/pinctrl-zynqmp.c

@@ -927,15 +927,6 @@ static int zynqmp_pinctrl_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int zynqmp_pinctrl_remove(struct platform_device *pdev)
-{
-	struct zynqmp_pinctrl *pctrl = platform_get_drvdata(pdev);
-
-	pinctrl_unregister(pctrl->pctrl);
-
-	return 0;
-}
-
 static const struct of_device_id zynqmp_pinctrl_of_match[] = {
 	{ .compatible = "xlnx,zynqmp-pinctrl" },
 	{ }
@@ -948,7 +939,6 @@ static struct platform_driver zynqmp_pinctrl_driver = {
 		.of_match_table = zynqmp_pinctrl_of_match,
 	},
 	.probe = zynqmp_pinctrl_probe,
-	.remove = zynqmp_pinctrl_remove,
 };
 module_platform_driver(zynqmp_pinctrl_driver);