gpio: max77620: Use helper variable and clarify

Most other drivers fill out the gpio_irq_chip using a
struct gpio_irq_chip *girq helper variable for ease of
reading.

We also make a habit of explicitly assigning NULL and
zero to the parent IRQs when using ordinary IRQ handlers
in the driver, mostly for code readability and
maintenance.

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

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