drm/tegra: Plug memory leak
drm/tegra: Plug memory leak

Free the DRM device-private memory upon driver unload to make sure the
memory doesn't leak.

Signed-off-by: Thierry Reding <3055038c414aef68bf32c33b8118623e7554e0f2@nvidia.com>

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