gpio: ixp4xx: Convert to hierarchical GPIOLIB_IRQCHIP

This modifies the IXP4xx driver to use the new helpers
to handle the remapping of parent to child hardware irqs
in the gpiolib core.

This pulls the majority of the code out of the driver
and use the generic code in gpiolib.

Cc: Thomas Gleixner <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Lina Iyer <[email protected]>
Cc: Jon Hunter <[email protected]>
Cc: Sowjanya Komatineni <[email protected]>
Cc: Bitan Biswas <[email protected]>
Cc: [email protected]
Cc: Thierry Reding <[email protected]>
Cc: Brian Masney <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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