pinctrl: nomadik: don't default-flag IRQs as falling

There is no point in adding any default trigger for these
GPIO interrupts: the device tree should contain all trigger
information and the platforms using the driver boots
exclusively from device tree.

Also the boot log is nagging me to fix this:

[ 0.771057] ------------[ cut here ]------------
[ 0.775695] WARNING: CPU: 0 PID: 1 at
../drivers/gpio/gpiolib.c:1622 _gpiochip_irqchip_add+0x138/0x160
[ 0.785034] /soc/gpio@8012e000: Ignoring 2 default trigger
(...)
[ 0.942962] gpio 8012e000.gpio: at address e08f8000
(etc ad nauseam)

Suggested-by: Marc Zyngier <[e-mail]>
Acked-by: Marc Zyngier <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/nomadik/pinctrl-nomadik.c

···
 				   irqchip,
 				   0,
 				   handle_edge_irq,
-				   IRQ_TYPE_EDGE_FALLING);
+				   IRQ_TYPE_NONE);
 	if (ret) {
 		dev_err(&dev->dev, "could not add irqchip\n");
 		gpiochip_remove(&nmk_chip->chip);