drm/radeon: Update to Linux 3.9

[Romick]

https://github.com/mneumann/DragonFlyBSD/tree/drm_radeon_linux_3_9 works with 
<Turks [Radeon HD 6670]>

two monitors: VGA & HDMI.

-- 
  with best reagrds, Yellow Rabbit
  DragonFly 4.1-DEVELOPMENT x86_64