hdat: Add P9 compatible property
hdat: Add P9 compatible property

Add p9 compatible property for various nodes.

Signed-off-by: Oliver O'Halloran <3dfaff8fa6ae977f042064a112a6aac576279b9b@gmail.com>
[3dfaff8fa6ae977f042064a112a6aac576279b9b@gmail.com: remove ibm,power9-nx compat]
Signed-off-by: Vasant Hegde <a6d753843573f7bfed5075c1e875b0be8007a0ab@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

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