hdata/vpd: Add vendor property
hdata/vpd: Add vendor property

ibm,vpd blob contains VN field. Use that to populate vendor property
for various FRU's.

Signed-off-by: Vasant Hegde <a6d753843573f7bfed5075c1e875b0be8007a0ab@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

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