drivers: interrupt_controller: Enable PINT-irq when deepsleep is not used

DisableDeepSleepIRQ() disables the NVIC irq, while PINT need it to fire an
event when the interrupt is used. So while the interrupt is not used in
DeepSleep mode, it should still be available to be used.

Signed-off-by: Hessel van der Molen <hvandermolen@dexels.com>