KVM: PPC: Book3S HV: XIVE: Show VP id in debugfs

Print out the VP id of each connected vCPU, this allow to see:
- the VP block base in which OPAL encodes information that may be
  useful when debugging
- the packed vCPU id which may differ from the raw vCPU id if the
  latter is >= KVM_MAX_VCPUS (2048)

Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>