KVM: Export kvm_init_irq_routing

On PPC, we can have different types of interrupt controllers, so we really
only know that we are going to use one when we created it.

Export kvm_init_irq_routing() to common code, so that we don't have to call
kvm_irqchip_create().

Signed-off-by: Alexander Graf <[email protected]>
diff --git a/kvm-stub.c b/kvm-stub.c
index 5457fe8..dec7a83 100644
--- a/kvm-stub.c
+++ b/kvm-stub.c
@@ -122,6 +122,10 @@
     return -ENOSYS;
 }
 
+void kvm_init_irq_routing(KVMState *s)
+{
+}
+
 void kvm_irqchip_release_virq(KVMState *s, int virq)
 {
 }