drm-kmod and other kmod stuff in ports

[Emiel Kollof]

Hi gang,

Great work on dfbsd, it's running reliably on two of my machines, a laptop
and a desktop station. Also, splitting off dfports is a great idea. The
current situation is that both the drm-kmod port and the nvidia binary
driver port are now horribly broken (because of recent commits).

I'm not handy enough with kmods (and the current module source base) to fix
them myself, but maybe these kld-based ports should be overridden in
dfports? It's also a nice test-case that semi-regularly updated.

Any takers?

Cheers,
Emiel