drivers: interrupt_controller: Place API into iterable section

Commit e63c6cd5 introduced device API
macros to be used by driver implementations. The DEVICE_API macro
ensures the passed API instance is placed in the corresponding iterable
section to allow for runtime checks.

Add wrapper DEVICE_API macro to all its_driver_api instances.

Signed-off-by: Pieter De Gendt <pieter.degendt@basalte.be>