linux-phytec-fsl

drm/nouveau/platform: release IOMMU's mm upon exit

nvkm_mm_fini() was not called when exiting the driver, resulting in a
memory leak. Fix this.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>