core/configs/tools: Switch PCI configuration format to single BDF value

core/configs/tools: Switch PCI configuration format to single BDF value

There is no value in splitting up the PCI device address in the config
format into bus and devfn. Fold them into a single value that can easier
be matched and is also easily be split up again via new helper macros
whenever needed.

This generates some work for locally maintained config file, sorry.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>