hw/p8-i2c: Print the set error bits
hw/p8-i2c: Print the set error bits

This is purely to save me from having to look it up every time someone
gets an I2C error.

Signed-off-by: Oliver O'Halloran <3dfaff8fa6ae977f042064a112a6aac576279b9b@gmail.com>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.ibm.com>

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