Allowing commands like port 1 lldp block and port 2 lldp permit

so we are able to enable/disable lldp transmission on a specific
port.

rtl837x_common.h

@@ -131,6 +131,7 @@ struct flash_region_t {
 };
 
 extern __xdata char port_names[9][PORT_NAME_SIZE];
+extern __xdata uint16_t lldp_port_status;
 
 extern __xdata bool stp_enabled;