drm/nv50: cleanup nv50_fifo.c

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --cc drivers/gpu/drm/nouveau/nouveau_drv.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/nv50_fifo.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/nv50_graph.c
Simple merge