drm/tegra: gem - Make tegra_bo_import() static

The function is never used outside of the source file and therefore can
be locally scoped.
Signed-off-by: NThierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/gem.c

@@ -169,7 +169,8 @@ struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
 	return ERR_PTR(ret);
 }
 
-struct tegra_bo *tegra_bo_import(struct drm_device *drm, struct dma_buf *buf)
+static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
+					struct dma_buf *buf)
 {
 	struct dma_buf_attachment *attach;
 	struct tegra_bo *bo;