Not doing so might cause IO-Page-Faults when a device uses
an alias request-id and the alias-dte is left in a lower
page-mode which does not cover the address allocated from
the iova-allocator.

Fixes: 492667da ('x86/amd-iommu: Remove amd_iommu_pd_table')
Cc: stable@vger.kernel.org
Signed-off-by: NJoerg Roedel <jroedel@suse.de>