Update lldp.service.j2

Author: abdosi

files/build_templates/per_namespace/lldp.service.j2

@@ -20,3 +20,6 @@ ExecStartPre=/usr/local/bin/{{docker_container_name}}.sh start{% if multi_instan
 ExecStart=/usr/local/bin/{{docker_container_name}}.sh wait{% if multi_instance == 'true' %} %i{% endif %}
 ExecStop=/usr/local/bin/{{docker_container_name}}.sh stop{% if multi_instance == 'true' %} %i{% endif %}
 RestartSec=30
+
+[Install]
+WantedBy=sonic.target