dm: pass mac seed not to use vm name

Physical NIC mac address is used for generate UOS mac address.
This patch uses a new parameters to pass this information
instead of vm name.

Tracked-On: #1987

Signed-off-by: Jie Deng <jie.deng@intel.com>
Acked-by: Yan, Like <like.yan@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>

devicemodel/hw/pci/virtio/virtio_net.c

@@ -818,7 +818,7 @@ virtio_net_init(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
 	 */
 	if (!mac_provided) {
 		snprintf(nstr, sizeof(nstr), "%d-%d-%s", dev->slot,
-		    dev->func, vmname);
+		    dev->func, mac_seed);
 
 		MD5_Init(&mdctx);
 		MD5_Update(&mdctx, nstr, strlen(nstr));