Nouveau Open-Source Driver Updates

In the past day there have been a number of commits to the xf86-video-nouveau git code. This recent activity started out with clamping NV_MEMORY_TO_MEMORY_FORMAT_LINE_COUNT to 2047 lines followed by an X-Video fix with freeing notifiers. Changing with the Nouveau driver earlier today was adapting the code to support drm 0.0.10 with additional work being done for handling sub-channel code, fixing UTS/DFS in some transfer sizes, and removing the debugging ErrorF statements. All of this recent work has been done in the master branch of nouveau/xf86-video-nouveau.