Add section for NIC virtual functions

[harp-intel]

Virtual Functions

Bus	Name	Associated interface
0000:c0:11.0	Ethernet Adaptive Virtual Function	eth0
0000:c0:11.1	Ethernet Adaptive Virtual Function	eth0
0000:c0:11.2	Ethernet Adaptive Virtual Function	eth0

I see two ways it could be done:

By checking the memory mapping under lshw -c network
physical interfaces on a card share the same iomemory regions (always?), and the bus address start
virtual interfaces use memory regions from physical card's memory space
Using files under /sys/bus/pci/devices in a manner similar to this script https://github.com/OpenVisualCloud/Media-Transport-Library/blob/main/script/nicctl.sh (BSD-3-Clause)

Split from this original Issue: #377