smmu_flush_regs() does TLB/PTC flush all when freeing a second level
page table. This isn't necessay at all since each pte entry has been
already maintained by address in the above flush_ptc_and_tlb().
Signed-off-by: NHiroshi Doyu <hdoyu@nvidia.com>
Signed-off-by: NJoerg Roedel <joro@8bytes.org>