Hi Ivan,
We do not have official IEC61508 certification, it is more common that tool vendors like us provide proven in use statements, rather than official certification. Please submit a new case request with the MCU and CodeWarrior version being used so we can send this document to you.
Here is a tutorial that explains how to enter a new case:
How to submit a new question for NXP Support
Hope it helps!
Best Regards,
Carlos Mendoza
Technical Support Engineer