pinctrl: baytrail: Group GPIO IRQ chip initialization

After commit 5ea422750a9f ("pinctrl: baytrail: Pass irqchip when
adding gpiochip") the GPIO IRQ chip structure is being initialized
under conditional when IRQ resource has been discovered. But that
commit left aside the assignment of ->init_valid_mask() callback
that is done unconditionally.

For sake of consistency and preventing some garbage in GPIO IRQ chip
structure group initialization together.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>

drivers/pinctrl/intel/pinctrl-baytrail.c

@@ -1529,7 +1529,6 @@ static int byt_gpio_probe(struct byt_gpio *vg)
 	gc->add_pin_ranges = byt_gpio_add_pin_ranges;
 	gc->parent	= &vg->pdev->dev;
 	gc->ngpio	= vg->soc_data->npins;
-	gc->irq.init_valid_mask	= byt_init_irq_valid_mask;
 
 #ifdef CONFIG_PM_SLEEP
 	vg->saved_context = devm_kcalloc(&vg->pdev->dev, gc->ngpio,
@@ -1553,6 +1552,7 @@ static int byt_gpio_probe(struct byt_gpio *vg)
 		girq = &gc->irq;
 		girq->chip = &vg->irqchip;
 		girq->init_hw = byt_gpio_irq_init_hw;
+		girq->init_valid_mask = byt_init_irq_valid_mask;
 		girq->parent_handler = byt_gpio_irq_handler;
 		girq->num_parents = 1;
 		girq->parents = devm_kcalloc(&vg->pdev->dev, girq->num_parents,