KVM: s390: add GISA interrupts to FLIC ioctl interface

Pending interrupts marked in the GISA IPM are required to
become part of the answer of ioctl KVM_DEV_FLIC_GET_ALL_IRQS.

The ioctl KVM_DEV_FLIC_ENQUEUE is already capable to enqueue
adapter interrupts when a GISA is present.

With ioctl KVM_DEV_FLIC_CLEAR_IRQS the GISA IPM wil be cleared
now as well.

Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>