kvm_config: add CONFIG_VIRTIO_MENU

Make sure that make kvmconfig enables all the virtio drivers even if it is
preceded by a make allnoconfig.
Signed-off-by: Lénaïc Huard <lenaic@lhuard.fr>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

kernel/configs/kvm_guest.config

@@ -20,6 +20,7 @@ CONFIG_PARAVIRT=y
 CONFIG_KVM_GUEST=y
 CONFIG_S390_GUEST=y
 CONFIG_VIRTIO=y
+CONFIG_VIRTIO_MENU=y
 CONFIG_VIRTIO_PCI=y
 CONFIG_VIRTIO_BLK=y
 CONFIG_VIRTIO_CONSOLE=y