KVM: s390: guestdbg: filter i-fetch events on icpts

We already filter PER events reported via icpt code 8. For icpt code
4 and 56, this is still missing.

So let's properly detect if we have a debugging event and if we have to
inject a PER i-fetch event into the guest at all.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>