OCC: Adjust log levels. Many to PR_DEBUG, a few to prerror()
OCC: Adjust log levels. Many to PR_DEBUG, a few to prerror()

Basically, errors should be logged as errors and for the most part,
standard booting with log level of PR_NOTICE doesn't need debug
level output.

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

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