drm/nouveau: Use drm_crtc_vblank_crtc()

Replace the open coded drm_crtc_vblank_crtc() with the real
thing.

Cc: Karol Herbst <kherbst@redhat.com>
Cc: Lyude Paul <lyude@redhat.com>
Cc: Danilo Krummrich <dakr@redhat.com>
Cc: nouveau@lists.freedesktop.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240408190611.24914-4-ville.syrjala@linux.intel.com
Reviewed-by: Lyude Paul <lyude@redhat.com>

Author: vsyrjala

drivers/gpu/drm/nouveau/nouveau_display.c

@@ -83,7 +83,7 @@ static bool
 nouveau_display_scanoutpos_head(struct drm_crtc *crtc, int *vpos, int *hpos,
 				ktime_t *stime, ktime_t *etime)
 {
-	struct drm_vblank_crtc *vblank = &crtc->dev->vblank[drm_crtc_index(crtc)];
+	struct drm_vblank_crtc *vblank = drm_crtc_vblank_crtc(crtc);
 	struct nvif_head *head = &nouveau_crtc(crtc)->head;
 	struct nvif_head_scanoutpos_v0 args;
 	int retry = 20;