nrf52_bsim: Add support for level interrupt
nrf52_bsim: Add support for level interrupt

Change in the MCU/interrupt handler model
which enables using the new nrf52 HW models irq controller
level interrupts.

Note that this change requires the updated HW models which
provide the new level based interrupts API.

Signed-off-by: Alberto Escolar Piedras <52be3174920ed06cbdfbcf9622a1a6c68e942617@oticon.com>

galak/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr