NaxRiscv results integration

[Dolu1990]

Hi,

I got embench to run on NaxRiscv (https://github.com/SpinalHDL/NaxRiscv)
I was looking to integrate its results to this repo, but it seems that the number published are for a old revision of embench, and since, quite a few testes were added.

So, if once there is some push to update all the number on this repo, let's me know, i can catch up and also provide the NaxRiscv one + ways to reproduce in simulation.

Thanks anway for the opensource tests :D