pinctrl: pinctrl-at91-pio4: Set irq handler and data in one go

Replace the two separate calls for setting the irq handler and data with a
single irq_set_chained_handler_and_data() call.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20201108180144.28594-1-martin@kaiser.cx


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>