KVM: Move irq ack notifier list to arch independent code

Mask irq notifier list is already there.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 3bee948..6eca153 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -958,6 +958,7 @@
 		goto out;
 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 	INIT_HLIST_HEAD(&kvm->mask_notifier_list);
+	INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
 #endif
 
 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET