pinctrl: imx: do not announce driver initialization

It is not usual that drivers announce when they have been initialized.
use dev_dbg to announce device initialization.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/pinctrl/nxp/pinctrl-imx.c

@@ -222,7 +222,7 @@ int imx_pinctrl_probe(struct udevice *dev,
 			return -ENOMEM;
 	}
 
-	dev_info(dev, "initialized IMX pinctrl driver\n");
+	dev_dbg(dev, "initialized IMX pinctrl driver\n");
 
 	return 0;
 }