KVM: s390: add kvm stat counter for all diagnoses

Sometimes kvm stat counters are the only performance metric to check
after something went wrong. Let's add additional counters for some
diagnoses.

In addition do the count for diag 10 all the time, even if we inject
a program interrupt.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Jens Freimann <jfrei@linux.vnet.ibm.com>