powerpc updates for 6.8

 - Add initial support to recognise the HeXin C2000 processor.

 - Add papr-vpd and papr-sysparm character device drivers for VPD & sysparm
   retrieval, so userspace tools can be adapted to avoid doing raw firmware
   calls from userspace.

 - Sched domains optimisations for shared processor partitions on P9/P10.

 - A series of optimisations for KVM running as a nested HV under PowerVM.

 - Other small features and fixes.

Thanks to: Aditya Gupta, Aneesh Kumar K.V, Arnd Bergmann, Christophe Leroy,
Colin Ian King, Dario Binacchi, David Heidelberg, Geoff Levand, Gustavo A.
R. Silva, Haoran Liu, Jordan Niethe, Kajol Jain, Kevin Hao, Kunwu Chan, Li
kunyu, Li zeming, Masahiro Yamada, Michal Suchánek, Nathan Lynch, Naveen N Rao,
Nicholas Piggin, Randy Dunlap, Sathvika Vasireddy, Srikar Dronamraju, Stephen
Rothwell, Vaibhav Jain, Zhao Ke.
Merge branch 'topic/ppc-kvm' into next

Merge our topic branch containing KVM related patches.