drm: Move drm_class to drm_internal.h

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
index d6dc755..7e459bf 100644
--- a/drivers/gpu/drm/drm_internal.h
+++ b/drivers/gpu/drm/drm_internal.h
@@ -71,6 +71,8 @@
 int drm_remove_magic(struct drm_master *master, drm_magic_t magic);
 
 /* drm_sysfs.c */
+extern struct class *drm_class;
+
 struct class *drm_sysfs_create(struct module *owner, char *name);
 void drm_sysfs_destroy(void);
 struct device *drm_sysfs_minor_alloc(struct drm_minor *minor);