drm/tegra: gem - Make tegra_bo_import() static
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: Thierry Reding <3055038c414aef68bf32c33b8118623e7554e0f2@nvidia.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs