qemu: enalbe hotplugging of macvtap device with multiqueue

in commit 81a110, multiqueue for macvtap is enabled but forget
to support hotplugging enabled
Signed-off-by: NShanzhi Yu <shyu@redhat.com>

src/qemu/qemu_hotplug.c

@@ -892,10 +892,11 @@ int qemuDomainAttachNetDevice(virConnectPtr conn,
         goto cleanup;
     }
 
-    /* Currently nothing besides TAP devices supports multiqueue. */
+    /* Currently only TAP/macvtap devices supports multiqueue. */
     if (net->driver.virtio.queues > 0 &&
         !(actualType == VIR_DOMAIN_NET_TYPE_NETWORK ||
-          actualType == VIR_DOMAIN_NET_TYPE_BRIDGE)) {
+          actualType == VIR_DOMAIN_NET_TYPE_BRIDGE ||
+          actualType == VIR_DOMAIN_NET_TYPE_DIRECT)) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Multiqueue network is not supported for: %s"),
                        virDomainNetTypeToString(actualType));