drivers: gpio: gpio_mcux_lpc: add support for module interrupts

On iMX.RT devices, the number of GPIO pins exceeds the maximum of
64 that the PINT interrupt controller can support. Therefore, two
interrupt lines are now shared between the GPIO modules.

This patch allows the user to set the interrupt source for a GPIO
peripheral. For most LPC devices, this will always be the PINT. For some
RT devices, the PINT cannot use pins on GPIO modules other than 0 and 1
as input, and thus the INTA and INTB sources should be used.

Since Zephyr does not support sharing these interrupt between all GPIO
controllers, the user must configure a subset of all GPIO controllers to
use the shared module interrupts. An example of how to do so is provided
for the RT595 EVK.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>