drm/nouveau: implement module init functions in nouveau_drm.c

These currently just call the existing ones in nouveau_drv.c, but will be
extended in upcoming commits.  This needed to be separated from the current
code as there will be some header clashes until things are ported.

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

drivers/gpu/drm/nouveau/nouveau_fbcon.c

@@ -44,7 +44,7 @@
 #include "drm_crtc_helper.h"
 #include "drm_fb_helper.h"
 #include "nouveau_drv.h"
-#include "nouveau_drm.h"
+#include <nouveau_drm.h>
 #include "nouveau_crtc.h"
 #include "nouveau_fb.h"
 #include "nouveau_fbcon.h"