qcacmn: clear the tx_desc flags in V2 flow_ctrl dp_tx_desc_free

Make sure to clear the tx_desc->flags field before putting the tx_desc to
free pool. This was not takencare in V2 flow_control implementation.

Change-Id: I666b9b09de62d52cffc45e2b6db3a6be06d688e8
CRs-Fixed: 2186884

dp/wifi3.0/dp_tx_desc.h

@@ -177,6 +177,7 @@ dp_tx_desc_free(struct dp_soc *soc, struct dp_tx_desc_s *tx_desc,
 	struct dp_tx_desc_pool_s *pool = &soc->tx_desc[desc_pool_id];
 
 	qdf_spin_lock_bh(&pool->flow_pool_lock);
+	tx_desc->flags = 0;
 	dp_tx_put_desc_flow_pool(pool, tx_desc);
 	switch (pool->status) {
 	case FLOW_POOL_ACTIVE_PAUSED: