s390/pci: stash associated GISA designation

For passthrough devices, we will need to know the GISA designation of the
guest if interpretation facilities are to be used.  Setup to stash this in
the zdev and set a default of 0 (no GISA designation) for now; a subsequent
patch will set a valid GISA designation for passthrough devices.
Also, extend mpcific routines to specify this stashed designation as part
of the mpcific command.

Reviewed-by: Pierre Morel <[email protected]>
Reviewed-by: Niklas Schnelle <[email protected]>
Reviewed-by: Christian Borntraeger <[email protected]>
Signed-off-by: Matthew Rosato <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christian Borntraeger <[email protected]>

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