vfio/type1: revert "block on invalid vaddr"

Revert this dead code:
  commit 898b9eae

 ("vfio/type1: block on invalid vaddr")

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/1675184289-267876-6-git-send-email-steven.sistare@oracle.com


Signed-off-by: Alex Williamson <alex.williamson@redhat.com>