phb4: Skip attempting to fix PHBs broken on boot
phb4: Skip attempting to fix PHBs broken on boot

If a PHB is marked broken it didn't work on boot, and if it didn't work
on boot then there's no point trying to recover it later

Signed-off-by: Russell Currey <b5ebcef270cdc73fa0593440445c07a93ae1bccb@russell.cc>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

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