gpio: ep93xx: Fix wrong irq numbers in port F

Port F IRQ's should be statically mapped to EP93XX_GPIO_F_IRQ_BASE.

So we need to specify girq->first otherwise:

"If device tree is used, then first_irq will be 0 and
IRQ's get mapped dynamically on the fly"

And that's not the thing we want.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

drivers/gpio/gpio-ep93xx.c

@@ -416,6 +416,7 @@ static int ep93xx_gpio_add_bank(struct ep93xx_gpio_chip *egc,
 		girq->default_type = IRQ_TYPE_NONE;
 		girq->handler = handle_level_irq;
 		gc->to_irq = ep93xx_gpio_f_to_irq;
+		girq->first = EP93XX_GPIO_F_IRQ_BASE;
 	}
 
 	return devm_gpiochip_add_data(dev, gc, epg);