Tegra 20 IOMMU H/W, GART (Graphics Address Relocation Table). This
patch implements struct iommu_ops for GART for the upper IOMMU API.

This H/W module supports only single virtual address space(domain),
and manages a single level 1-to-1 mapping H/W translation page table.

[With small fixes by Joerg Roedel]
Signed-off-by: NHiroshi DOYU <hdoyu@nvidia.com>
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>