vswitch.xml: Add entry for dpdkvhostuser userspace-tso.

get_status for dpdkvhostuser(/client) netdev class may display
userspace-tso status.

Fixes: a5669fd ("netdev-dpdk: Drop TSO in case of conflicting virtio features.")
Signed-off-by: Kevin Traynor <ktraynor@redhat.com>
Acked-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: Simon Horman <horms@ovn.org>

vswitchd/vswitch.xml

@@ -3683,6 +3683,9 @@ ovs-vsctl add-port br0 p0 -- set Interface p0 type=patch options:peer=p1 \
             Each virtqueue will have it's size reported, where n is the
             virtqueue number from 0..(num_of_vrings-1).
           </column>
+          <column name="status" key="userspace-tso">
+            Whether userspace-tso is enabled or disabled.
+          </column>
       </group>
     </group>