KVM will have to query these functions, let's add at least the query
capabilities.

PCKMO has RRE format, as bit 16-31 are ignored, we can still use the
existing function. As PCKMO won't touch the cc, let's force it to 0
upfront.
Signed-off-by: NDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: NIngo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com>
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>