KVM: s390: Tracing APCB changes

kvm_arch_crypto_set_masks is a new function to centralize
the setup the APCB masks inside the CRYCB SIE satellite.

To trace APCB mask changes, we add KVM_EVENT() tracing to
both kvm_arch_crypto_set_masks and kvm_arch_crypto_clear_masks.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Message-Id: <1538728270-10340-2-git-send-email-pmorel@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>