gpiolib: fix gpio_do_set_config()

Commit d90f3685 ("gpiolib: have a single place of calling
set_config()") introduced a regression where we don't pass the right
variable as argument to the set_config() callback of gpio driver from
gpio_set_config(). After reverting two additional patches that came
on top of it - this addresses the issue by changing the type of the last
argument of gpio_do_set_config() to unsigned long and making sure the
packed config variable is actually used in gpio_set_config().

Fixes: d90f3685 ("gpiolib: have a single place of calling set_config()")
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>

drivers/gpio/gpiolib.c

@@ -3036,12 +3036,12 @@ EXPORT_SYMBOL_GPL(gpiochip_free_own_desc);
  */
 
 static int gpio_do_set_config(struct gpio_chip *gc, unsigned int offset,
-			      enum pin_config_param mode)
+			      unsigned long config)
 {
 	if (!gc->set_config)
 		return -ENOTSUPP;
 
-	return gc->set_config(gc, offset, mode);
+	return gc->set_config(gc, offset, config);
 }
 
 static int gpio_set_config(struct gpio_chip *gc, unsigned int offset,
@@ -3062,7 +3062,7 @@ static int gpio_set_config(struct gpio_chip *gc, unsigned int offset,
 	}
 
 	config = PIN_CONF_PACKED(mode, arg);
-	return gpio_do_set_config(gc, offset, mode);
+	return gpio_do_set_config(gc, offset, config);
 }
 
 static int gpio_set_bias(struct gpio_chip *chip, struct gpio_desc *desc)