Remove rest of mallocs from message_bridge_client

Use a pool for the client too.  Docs for interleaving for SCTP type 1
say that there can be at most 1 partial message being delivered to
userspace at a time from all streams for an association, so 2 messages
in the queue is good enough.

Change-Id: I0b1bd579b92ac540a72b8849d7933a56ff611355
Signed-off-by: Austin Schuh <austin.schuh@bluerivertech.com>
diff --git a/aos/network/sctp_client.h b/aos/network/sctp_client.h
index 1ba32ff..1a0a907 100644
--- a/aos/network/sctp_client.h
+++ b/aos/network/sctp_client.h
@@ -48,11 +48,16 @@
   void LogSctpStatus(sctp_assoc_t assoc_id);
 
   void SetMaxSize(size_t max_size) { sctp_.SetMaxSize(max_size); }
+  void SetPoolSize(size_t pool_size) { sctp_.SetPoolSize(pool_size); }
 
   void SetAssociationId(sctp_assoc_t sac_assoc_id) {
     sac_assoc_id_ = sac_assoc_id;
   }
 
+  void FreeMessage(aos::unique_c_ptr<Message> &&message) {
+    sctp_.FreeMessage(std::move(message));
+  }
+
  private:
   struct sockaddr_storage sockaddr_remote_;
   struct sockaddr_storage sockaddr_local_;