drm/tegra: gem: Reshuffle declarations

Move declarations in the gem.h header file into the same order as the
corresponding definitions in gem.c.
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/gem.h

@@ -68,10 +68,10 @@ void tegra_bo_free_object(struct drm_gem_object *gem);
 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
 			 struct drm_mode_create_dumb *args);
 
-int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma);
-
 extern const struct vm_operations_struct tegra_bo_vm_ops;
 
+int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma);
+
 struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
 				       struct drm_gem_object *gem,
 				       int flags);