iommu/vt-d: Enable Translation only if it was previously disabled
iommu/vt-d: Enable Translation only if it was previously disabled

Do not touch the TE bit unless we know translation is
disabled.

Tested-by: ZhenHua Li <a90aef1961c2e508ad63d1531b42c300a9eb4b82@hp.com>
Tested-by: Baoquan He <1b95acc14c82271bede46a8b6a84bd6be6240a7c@redhat.com>
Signed-off-by: Joerg Roedel <61aff96566804ea1da8a65de5bcc892ce07caceb@suse.de>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs