skiboot/hw/imc: Add nest_memory region to "exports" node
skiboot/hw/imc: Add nest_memory region to "exports" node

Exports the In-Memory Collection counter nest memory to
the OS. This allows the OS to view the nest counter
region directly. This helps in nest microcode debug
and to check counter raw value.

Signed-off-by: Madhavan Srinivasan <50c9fed97c2a760bbf32e7fdccf39ca6a997eabd@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

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