MAINTAINERS.yml: Add myself to bouffalolab maintainers

[VynDragon]

Add VynDragon to bouffalolab entries

[nandojve]

Hi @MaureenHelm ,

I already talked with @VynDragon. I mentioned that after the first PR from on Bouffalo Lab been merged I would like to have as community Collaborator. We defined some milestones at BouffaloLab RFC and when they are conclude it would be a good moment to became community maintainer. When that happen we possible will switch places.

After sometime I'll decrease my participation on this platform. Bouffalo Lab demonstrate interest to have their MCU series in the mainline and after the HAL been approved their allocate internal personnel to help us to introduce the 3 MCU series. I hope soon Bouffalo Lab can direct help to maintain their content together with the community.