pinctrl: sx150x: Convert to immutable irq_chip

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

I switched to consistently using irqd_to_hwirq() consistently
while we are at it.

As the driver now needs to get the gpio_chip in the .irq_mask
and .irq_unmask callbacks, I switched to a pattern where we
first fetch the gpio_chip and then the state container from
that in two steps. The compiler will do the same thing anyway.

Cc: Marc Zyngier <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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