drm/nouveau/dispnv04: Remove some unused functions

Removes some functions that are not used anywhere:
nv04_display_late_takedown() nv04_display_early_init()

This was partially found by using a static code analysis program
called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/dispnv04/disp.h

@@ -90,8 +90,6 @@ nv04_display(struct drm_device *dev)
 }
 
 /* nv04_display.c */
-int nv04_display_early_init(struct drm_device *);
-void nv04_display_late_takedown(struct drm_device *);
 int nv04_display_create(struct drm_device *);
 void nv04_display_destroy(struct drm_device *);
 int nv04_display_init(struct drm_device *);