misc: microchip: pci1xxxx: Convert to immutable irqchip

Convert the driver to immutable irq-chip with a bit of
intuition.

Cc: linux-gpio@vger.kernel.org
Cc: Marc Zyngier <maz@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230223133252.2257276-1-linus.walleij@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>