KVM: s390: Stub out kvmtrace

Signed-off-by: Avi Kivity <avi@qumranet.com>
diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
index 2489b34..1761b74 100644
--- a/arch/s390/kvm/Kconfig
+++ b/arch/s390/kvm/Kconfig
@@ -36,6 +36,9 @@
 
 	  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