pinctrl: st: don't specify default interrupt trigger

Thanks to 332e99d5 which now alerts of default
trigger usage when configuring interrupts.
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Acked-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-st.c

@@ -1512,7 +1512,7 @@ static int st_gpiolib_register_bank(struct st_pinctrl *info,
 	if (info->irqmux_base || gpio_irq > 0) {
 		err = gpiochip_irqchip_add(&bank->gpio_chip, &st_gpio_irqchip,
 					   0, handle_simple_irq,
-					   IRQ_TYPE_LEVEL_LOW);
+					   IRQ_TYPE_NONE);
 		if (err) {
 			gpiochip_remove(&bank->gpio_chip);
 			dev_info(dev, "could not add irqchip\n");