KVM: PPC: Expose level based interrupt cap

Now that we have all the level interrupt magic in place, let's
expose the capability to user space, so it can make use of it!

Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 3707704..919ae53 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -539,6 +539,7 @@
 #define KVM_CAP_XCRS 56
 #endif
 #define KVM_CAP_PPC_GET_PVINFO 57
+#define KVM_CAP_PPC_IRQ_LEVEL 58
 
 #ifdef KVM_CAP_IRQ_ROUTING