s390/pci: externalize the SIC operation controls and routine

A subsequent patch will be issuing SIC from KVM -- export the necessary
routine and make the operation control definitions available from a header.
Because the routine will now be exported, let's rename __zpci_set_irq_ctrl
to zpci_set_irq_ctrl and get rid of the zero'd iib wrapper function of
the same name.

Reviewed-by: Niklas Schnelle <[email protected]>
Reviewed-by: Claudio Imbrenda <[email protected]>
Reviewed-by: Pierre Morel <[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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