staging: greybus: gpio: Replace macro irq_data_to_gpio_chip with function

Replace the macro irq_data_to_gpio_chip with a static inline function to comply
with Linux coding style standards.

Signed-off-by: Brent Pappas <bpappas@pappasbrent.com>
Link: https://lore.kernel.org/r/20230117152857.22141-1-bpappas@pappasbrent.com


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