firmware may crash when DMA is used and many ARs are established at the same time

This issue only affects firmware with active DMA mode.
This issue is directly related to PSPNM-698 and introduces the real fix while PSPNM-698 just added a wrokaround

If DMA is active and there is a high netX CPU load combined with parallel AR etsbalishment to several IO Devices it may happen that the firmware crashed.

There is a race condition in the firmware that creates a small timeslot which is critical for "DMA finished interrupt" to occur. If the timeslot is hit the firmware will crash.