txgbe: vlan offload setting errors

[Jiawen Wu]

> > > Hello everyone,
> > > I recently added a txgbe port and enabled vlan offload.
> > > However, when I checked the dpdk logs, I noticed the following error:
> > > "2024-12-09T10:32:26.420709+08:00 txgbe_vlan_offload_set():
> > > Please stop port first."
> >
> > You should stop the device first, since VLAN offload cannot be changed when Rx
> > ring is enabled.
> 
> However, I haven't start the port yet. The port is new added.

Enable VLAN offload, then start the device.
It will be configured in txgbe_vlan_offload_config(), which is not limited by
hw->adapter_stopped.