Update:
I was wrong thinking it was the AHAB, the IMX8MM uses the HABv4, i just completely read over that line in the NXP documentation:
On iMX6, iMX7 and iMX8M, this feature is available and it is called HAB (High Assurance Boot).
On iMX8 and iMX8X, this feature is available and it is called AHAB (Advanced High Assurance Boot).
My bad.
Richard