gpio: stmpe: Fix forgotten refactoring

devm_gpiochip_add_data() or gpiochip_add_data() is called. This allocates an

.irq.valid_mask with as many bits set as there are GPIO lines in the chip, each

bit representing line 0..n-1. Drivers can exclude GPIO lines by clearing bits

from this mask. The mask must be filled in before gpiochip_irqchip_add() or

gpiochip_irqchip_add_nested() is called.

from this mask. The mask can be filled in the init_valid_mask() callback

that is part of the struct gpio_irq_chip.

To use the helpers please keep the following in mind:

	stmpe_gpio->chip.parent = &pdev->dev;

	stmpe_gpio->chip.of_node = np;

	stmpe_gpio->chip.base = -1;

	/*

	 * REVISIT: this makes sure the valid mask gets allocated and

	 * filled in when adding the gpio_chip, but the rest of the

	 * gpio_irqchip is still filled in using the old method

	 * in gpiochip_irqchip_add_nested() so clean this up once we

	 * get the gpio_irqchip to initialize while adding the

	 * gpio_chip also for threaded irqchips.

	 */

	stmpe_gpio->chip.irq.init_valid_mask = stmpe_init_irq_valid_mask;

	if (IS_ENABLED(CONFIG_DEBUG_FS))

                stmpe_gpio->chip.dbg_show = stmpe_dbg_show;

		girq->default_type = IRQ_TYPE_NONE;

		girq->handler = handle_simple_irq;

		girq->threaded = true;

		girq->init_valid_mask = stmpe_init_irq_valid_mask;

	}

	ret = gpiochip_add_data(&stmpe_gpio->chip, stmpe_gpio);