Fix vhost-user with dpdk

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2155173

Brew: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=50570059

Upstream: yes

Tested: reproduced the problem with dpdk-testpmd and iommu. checked the backport fixes the problem.

Signed-off-by: Laurent Vivier lvivier@redhat.com