pinctrl: lynxpoint: Enable pin configuration setting for GPIO chip

It appears that pin configuration for GPIO chip hasn't been enabled yet
due to absence of ->set_config() callback.

Enable it here for Intel Lynxpoint PCH.

Depends-on: 2956b5d9 ("pinctrl / gpio: Introduce .set_config() callback for GPIO chips")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>

drivers/pinctrl/intel/pinctrl-lynxpoint.c

@@ -874,6 +874,7 @@ static int lp_gpio_probe(struct platform_device *pdev)
 	gc->direction_output = lp_gpio_direction_output;
 	gc->get = lp_gpio_get;
 	gc->set = lp_gpio_set;
+	gc->set_config = gpiochip_generic_config;
 	gc->get_direction = lp_gpio_get_direction;
 	gc->base = -1;
 	gc->ngpio = LP_NUM_GPIO;