pinctrl: ingenic: Convert to immutable irq chip

Update the driver to use an immutable IRQ chip to fix this warning:

    "not an immutable chip, please consider fixing it!"

Preserve per-chip labels by adding an ->irq_print_chip() callback.

Acked-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
Link: https://lore.kernel.org/r/20220622185010.2022515-3-aidanmacdonald.0x0@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>