x86: pinctrl: Silence the warning when a pin is not found

This does not necessarily indicate a problem, since some pins are
optional. Let the caller show an error if necessary.
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/pinctrl/intel/pinctrl.c

@@ -154,7 +154,7 @@ static int pinctrl_get_device(uint pad, struct udevice **devp)
 			return 0;
 		}
 	}
-	printf("pad %d not found\n", pad);
+	log_debug("pad %d not found\n", pad);
 
 	return -ENOTBLK;
 }