Finding real-world kernel subsystems

I think the drm picture would look a lot tidier if in addition to just linking nodes using shared files, we'd group the ones in the same git repo (that's also in MAINTAINERS) together. Most of the links across the entire subsystem should then end up within such a git repo bubble. That should also help find a bunch of things in other parts of the tree which are closely related to the drm subsystem.

Which I guess is just another way to state that the graph does indeed not capture the group maintainership nature of how most things are done in drm.