network: traffic control: drop meta from QDisc and TClass

Since #22248, it is not necessary to manage QDisc and TClass in same Set
or Hashmap. Let's manage them independently.

src/network/networkd-queue.h

@@ -14,7 +14,8 @@ typedef struct NetDev NetDev;
 typedef struct NextHop NextHop;
 typedef struct Route Route;
 typedef struct RoutingPolicyRule RoutingPolicyRule;
-typedef struct TrafficControl TrafficControl;
+typedef struct QDisc QDisc;
+typedef struct TClass TClass;
 
 typedef enum RequestType {
         REQUEST_TYPE_ACTIVATE_LINK,
@@ -35,7 +36,8 @@ typedef enum RequestType {
         REQUEST_TYPE_ROUTE,
         REQUEST_TYPE_ROUTING_POLICY_RULE,
         REQUEST_TYPE_SET_LINK,
-        REQUEST_TYPE_TRAFFIC_CONTROL,
+        REQUEST_TYPE_TC_CLASS,
+        REQUEST_TYPE_TC_QDISC,
         REQUEST_TYPE_UP_DOWN,
         _REQUEST_TYPE_MAX,
         _REQUEST_TYPE_INVALID = -EINVAL,
@@ -57,7 +59,8 @@ typedef struct Request {
                 RoutingPolicyRule *rule;
                 void *set_link_operation_ptr;
                 NetDev *netdev;
-                TrafficControl *traffic_control;
+                QDisc *qdisc;
+                TClass *tclass;
                 void *object;
         };
         void *userdata;