iommu/tegra-smmu: Set IOMMU group name

Set the name of static IOMMU groups to help with debugging.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20200806155404.3936074-2-thierry.reding@gmail.com


Signed-off-by: Joerg Roedel <jroedel@suse.de>