external/opal-prd: Enhance PNOR error messages
external/opal-prd: Enhance PNOR error messages

Provide detailed feedback when encountering errors in the PNOR code.

Signed-off-by: Joel Stanley <4816dabf8db1bc6cac35b3a24cab2ff844b5b0c7@jms.id.au>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

legoater/skiboot,shenki/skiboot,mikey/skiboot,qemu/skiboot,open-power/skiboot,mikey/skiboot,mikey/skiboot,cyrilbur-ibm/skiboot,stewart-ibm/skiboot,qemu/skiboot,legoater/skiboot,shenki/skiboot,legoater/skiboot,open-power/skiboot,open-power/skiboot,apopple/skiboot,qemu/skiboot,apopple/skiboot,apopple/skiboot,ddstreet/skiboot,jk-ozlabs/skiboot,shenki/skiboot,shenki/skiboot,stewart-ibm/skiboot,cyrilbur-ibm/skiboot,qemu/skiboot,qemu/skiboot,legoater/skiboot,csmart/skiboot,open-power/skiboot,shenki/skiboot,open-power/skiboot,stewart-ibm/skiboot,legoater/skiboot,cyrilbur-ibm/skiboot,jk-ozlabs/skiboot,ddstreet/skiboot,csmart/skiboot,csmart/skiboot,ddstreet/skiboot,jk-ozlabs/skiboot