vfio_iommu_spapr_tce: Remove unneeded iommu_group_get_iommudata

This removes iommu_group_get_iommudata() as the result is never used.
As this is a minor cleanup, no change in behavior is expected.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>