Off-path SmartNIC DPU Port Binding with OVN

Off-path SmartNIC DPUs introduce an architecture change where network
agents responsible for NIC switch configuration and representor
interface plugging run on a separate SoC with its own CPU, memory and
that runs a separate OS kernel. The side-effect of that is that
hypervisor hostnames no longer match SmartNIC DPU hostnames which are
seen by ovs-vswitchd and OVN [3]_ agents while the existing port binding
code relies on that. The goal of this specification is to introduce
changes necessary to extend the existing hardware offload code to cope
with the hostname mismatch and related design challenges while reusing
the rest of the code. To do that, PCI(e) add-in card tracking is
introduced for boards with unique serial numbers so that it can be used
to determine the correct hostname of a SmartNIC DPU which is responsible
for a particular VF. Additionally, more information is suggested to be
passed in the "binding:profile" during a port update to facilitate
representor port plugging.