drivers: gpio: Smartbond: Add pdc support

This change allows to have GPIO interrupts configured
that will work while chip enters low power modes where
PD_COM is turned off.

PDC controller can wake up system on GPIO changes even when
PD_COM is off.

This is done by adding PDC entries that will wakeup Cortex-M33
at the same time when WAKEUP controller is programmed to
handle GPIO state changes.

Signed-off-by: Jerzy Kasenberg <jerzy.kasenberg@codecoup.pl>