Add menuconfig options to include modules for (virtio) vsockets. These are
used when running as Guest OS in a VM.
OpenWRT can be run in a vm (mostly commonly on the x86/64 and armsr
targets). Often it is convenient to have some sort of guest agent running,
to ease communication from host to guest.
Virtual Sockets provide this communication channel.
Virtio is a transport for this communication channel.
Virtual Sockets over virtio are for example used by Incus.
Virtual Sockets in general are used by most hypervisors, including VMware,
Hyper-V, and libvirt (qemu). These may need other transport-specific
modules not included in this commit.
Signed-off-by: Mathijs Rietbergen <mathijs.rietbergen@proton.me>