kernel: Drop drm1 drivers

* They were used for 3D OpenGL acceleration with ancient graphic cards
  from the 1990s to early 2000s

* Mesa removed support for them in August 2011, before its 8.0 release

* No Mesa 7.x version beeing available in dports anymore these drivers
  have become completely useless
drm: Remove unused PCI ids
Remove remaining drm1 bits

* Remove kernel compilation options and manpages for old drivers

* Make sure make upgrade removes old kernel modules and other
  files