Description of problem:
Live update to delete the vlan tag on the interface fail

Version-Release number of selected component (if applicable):
libvirt-7.10.0-1.el9.x86_64

How reproducible:
100%

Steps to Reproduce:
1.  Start vm with interface as below with vlan tag defined:
 # virsh dumpxml rhel9 | grep /interface -B10
    <interface type='bridge'>
      <mac address='52:54:00:da:b9:fb'/>
      <source bridge='ovsbr0'/>
      <virtualport type='openvswitch'>
        <parameters interfaceid='67f7ce64-6ca9-4bb1-9309-f244a4e12213'/>
      </virtualport>
      <target dev='vnet39'/>
      <model type='virtio'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
    </interface>

2. Live add vlan tag, succeed

1. cat  bridge_vlan.xml
     <interface type='bridge'>
         <mac address='52:54:00:da:b9:fb'/>
         <source bridge='ovsbr0'/>
         <virtualport type='openvswitch'>
           <parameters interfaceid='67f7ce64-6ca9-4bb1-9309-f244a4e12213'/>
         </virtualport>
         <target dev='vnet39'/>
         <vlan>
           <tag id='45'/>
         </vlan>
         <model type='virtio'/>
         <alias name='net0'/>
         <address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
       </interface>
2. virsh update-device rhel9 bridge_vlan.xml
   Device updated successfully

1. virsh dumpxml rhel9 | grep /interface -B13
       <interface type='bridge'>
         <mac address='52:54:00:da:b9:fb'/>
         <source bridge='ovsbr0'/>
         <vlan>
           <tag id='45'/>
         </vlan>
         <virtualport type='openvswitch'>
           <parameters interfaceid='67f7ce64-6ca9-4bb1-9309-f244a4e12213'/>
         </virtualport>
         <target dev='vnet39'/>
         <model type='virtio'/>
         <alias name='net0'/>
         <address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
       </interface>
2. ovs-vsctl show
   0415a226-8ac6-4721-a812-1f9d5754f969
       Bridge ovsbr0
           Port ovsbr0
               Interface ovsbr0
                   type: internal
           Port vnet39
               tag: 45
               Interface vnet39
       ovs_version: "2.15.3"

3. Live delete the vlan tag, fail:

1. cat bridge_del_vlan.xml
     <interface type='bridge'>
         <mac address='52:54:00:da:b9:fb'/>
         <source bridge='ovsbr0'/>
         <virtualport type='openvswitch'>
           <parameters interfaceid='67f7ce64-6ca9-4bb1-9309-f244a4e12213'/>
         </virtualport>
         <target dev='vnet39'/>
         <model type='virtio'/>
         <alias name='net0'/>
         <address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
       </interface>

1. virsh update-device rhel9 bridge_del_vlan.xml
   error: Failed to update device from bridge_del_vlan.xml
   error: internal error: Unable to set vlan configuration on port vnet39

Actual results:
VLAN tag can be added or value updated by update-device lively, but can not be deleted.

Expected results:
Step 3 should succeed

Additional info:
Network connections that support guest-transparent VLAN tagging include:
1) type='bridge' interfaces connected to an Open vSwitch bridge;
2) SRIOV Virtual Functions (VF) used via type='hostdev' (direct device assignment);
3) SRIOV VFs used via type='direct' with mode='passthrough' (macvtap "passthru" mode)
For 2), hostdev interface do not support live update;
For 1) and 3), the behavior is the same, vlan tag can be added or value updated by update-device lively, but can not be deleted.