MT#57719 Use media subscriptions: `call_get_dialogue()`

Start using the media subscriptions model
(based on newly introduced `media_subscription` objects)
in scope of `call_get_dialogue()`.

Change-Id: Id7b8f84354bcc0525ff180d94cedfc6dc29a7c63

daemon/call.c

@@ -4685,6 +4685,9 @@ tag_setup:
 	dialogue_unkernelize(tt, "dialogue signalling event");
 	__subscribe_offer_answer_both_ways(ft, tt);
 
+	/* susbcribe medias to medias */
+	__subscribe_matched_medias(ft, tt);
+
 done:
 	__monologue_unkernelize(ft, "dialogue signalling event");
 	dialogue_unkernelize(ft, "dialogue signalling event");