drm/vram-helper: Unexport drm_vram_helper_{alloc,release}_mm()

All GEM-VRAM-based drivers use auto-cleanup via drmm_vram_helper_init().
Unexport the manual APIs and make them internal implementation.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210702075434.27677-4-tzimmermann@suse.de

drivers/gpu/drm/drm_gem_vram_helper.c

@@ -1012,9 +1012,8 @@ static void drm_vram_mm_cleanup(struct drm_vram_mm *vmm)
  * Helpers for integration with struct drm_device
  */
 
-/* deprecated; use drmm_vram_mm_init() */
-struct drm_vram_mm *drm_vram_helper_alloc_mm(
-	struct drm_device *dev, uint64_t vram_base, size_t vram_size)
+static struct drm_vram_mm *drm_vram_helper_alloc_mm(struct drm_device *dev, uint64_t vram_base,
+						    size_t vram_size)
 {
 	int ret;
 
@@ -1036,9 +1035,8 @@ struct drm_vram_mm *drm_vram_helper_alloc_mm(
 	dev->vram_mm = NULL;
 	return ERR_PTR(ret);
 }
-EXPORT_SYMBOL(drm_vram_helper_alloc_mm);
 
-void drm_vram_helper_release_mm(struct drm_device *dev)
+static void drm_vram_helper_release_mm(struct drm_device *dev)
 {
 	if (!dev->vram_mm)
 		return;
@@ -1047,7 +1045,6 @@ void drm_vram_helper_release_mm(struct drm_device *dev)
 	kfree(dev->vram_mm);
 	dev->vram_mm = NULL;
 }
-EXPORT_SYMBOL(drm_vram_helper_release_mm);
 
 static void drm_vram_mm_release(struct drm_device *dev, void *ptr)
 {

include/drm/drm_gem_vram_helper.h

@@ -204,10 +204,6 @@ void drm_vram_mm_debugfs_init(struct drm_minor *minor);
  * Helpers for integration with struct drm_device
  */
 
-struct drm_vram_mm *drm_vram_helper_alloc_mm(
-	struct drm_device *dev, uint64_t vram_base, size_t vram_size);
-void drm_vram_helper_release_mm(struct drm_device *dev);
-
 int drmm_vram_helper_init(struct drm_device *dev, uint64_t vram_base,
 			  size_t vram_size);