KVM: s390: Stub out kvmtrace

Signed-off-by: Avi Kivity <avi@qumranet.com>

arch/s390/kvm/Kconfig

@@ -36,6 +36,9 @@ config KVM
 
 	  If unsure, say N.
 
+config KVM_TRACE
+       bool
+
 # OK, it's a little counter-intuitive to do this, but it puts it neatly under
 # the virtualization menu.
 source drivers/virtio/Kconfig