r308612:
  Allow DRM2 code to be built on platforms without AGP.  This patch is taken
  from original drm-3.8 code.
r308614:
  Allow embeding DRM2 code into kernel.  It's usefull for development (for
  netboot) and it also helps to boot FreeBSD on some embeded platforms (where
  we must boot kernel directly, without standard boot loader).