gpio: dln2: Include proper header

This driver has no business including <linux/gpio.h>, it is a
driver so include <linux/gpio/driver.h>.

GPIOF_DIR_IN/GPIOF_DIR_OUT are for consumers and should not be
used in drivers to use just 1/0 instead.

Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/gpio-dln2.c

···
 #include <linux/irqdomain.h>
 #include <linux/irq.h>
 #include <linux/irqchip/chained_irq.h>
-#include <linux/gpio.h>
 #include <linux/gpio/driver.h>
 #include <linux/platform_device.h>
 #include <linux/mfd/dln2.h>
···
 	struct dln2_gpio *dln2 = gpiochip_get_data(chip);
 
 	if (test_bit(offset, dln2->output_enabled))
-		return GPIOF_DIR_OUT;
+		return 0;
 
-	return GPIOF_DIR_IN;
+	return 1;
 }
 
 static int dln2_gpio_get(struct gpio_chip *chip, unsigned int offset)
···
 	if (dir < 0)
 		return dir;
 
-	if (dir == GPIOF_DIR_IN)
+	if (dir == 1)
 		return dln2_gpio_pin_get_in_val(dln2, offset);
 
 	return dln2_gpio_pin_get_out_val(dln2, offset);