can: mcp251x: mcp251x_gpio_setup(): Get rid of duplicate of_node assignment

GPIO library does copy the of_node from the parent device of the GPIO
chip, there is no need to repeat this in the individual drivers.
Remove assignment here.

For the details one may look into the of_gpio_dev_init()
implementation.

Link: https://lore.kernel.org/all/20211202205855.76946-1-andriy.shevchenko@linux.intel.comSigned-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/spi/mcp251x.c

@@ -600,9 +600,6 @@ static int mcp251x_gpio_setup(struct mcp251x_priv *priv)
 	gpio->ngpio = ARRAY_SIZE(mcp251x_gpio_names);
 	gpio->names = mcp251x_gpio_names;
 	gpio->can_sleep = true;
-#ifdef CONFIG_OF_GPIO
-	gpio->of_node = priv->spi->dev.of_node;
-#endif
 
 	return devm_gpiochip_add_data(&priv->spi->dev, gpio, priv);
 }