RISC-V management core
It's just the system management core, the same as Nvidia are doing, not the actual GPU cores like Think Silicon announced
https://think-silicon.com/2019/12/02/think-silicon-demonstrates-early-preview-of-industrys-first-risc-v-isa-based-3d-gpu-at-the-risc-v-summit/
Still, good to see, and there will be more and more things like this.