kvm: Introduce kvm_irqchip_add_msi_route Add a service that establishes a static route from a virtual IRQ line to an MSI message. Will be used for IRQFD and device assignment. As we will use this service outside of CONFIG_KVM protected code, stub it properly. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Avi Kivity <avi@redhat.com>