drm/nouveau: move flip-related channel setup to software engine

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nv04_software.c b/drivers/gpu/drm/nouveau/nv04_software.c
index d37de6e..a91cec6 100644
--- a/drivers/gpu/drm/nouveau/nv04_software.c
+++ b/drivers/gpu/drm/nouveau/nv04_software.c
@@ -23,6 +23,7 @@
  */
 
 #include "drmP.h"
+
 #include "nouveau_drv.h"
 #include "nouveau_ramht.h"
 #include "nouveau_software.h"