platforms/vesnin: PCI inventory via IPMI OEM
platforms/vesnin: PCI inventory via IPMI OEM

Replace raw protocol with OEM message supported by OpenBMC's IPMI
plugins.

BMC-side implementation (IPMI plug-in):
https://github.com/YADRO-KNS/phosphor-pci-inventory

Signed-off-by: Artem Senichev <0c258a2f6ea4356be7cf47b2488f5bb8b6c3902c@yadro.com>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.ibm.com>

qemu/skiboot,qemu/skiboot,shenki/skiboot,open-power/skiboot,shenki/skiboot,legoater/skiboot,legoater/skiboot,stewart-ibm/skiboot,qemu/skiboot,open-power/skiboot,legoater/skiboot,open-power/skiboot,stewart-ibm/skiboot,legoater/skiboot,open-power/skiboot,legoater/skiboot,qemu/skiboot,shenki/skiboot,qemu/skiboot,stewart-ibm/skiboot,shenki/skiboot,shenki/skiboot,open-power/skiboot