scan_system.py: Initial CPU parsing support

@mad-fjensen @mad-jrodriguez I've created this initial approach on how we can parse the CPU and SMB entries in a similar way to how the rest of the python classes work.

The idea on how we can migrate the CPU parsing from scan_system.sh is there. Please take into account that this is a good opportunity to only add what is really supported to the list as scan_system.sh still supports many EOS CPUs. Check with supported_components.md.