The manual says that bit 6 is IGN for all Page-Table Base Address
pointers, don't set it.

Fixes: aaac38f6 ("iommu/amd: Initial support for AMD IOMMU v2 page table")
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/14-v2-831cdc4d00f3+1a315-amd_iopgtbl_jgg@nvidia.comSigned-off-by: Joerg Roedel <jroedel@suse.de>