qcacmn: Include DS tx desc usage in global desc limit check

Make sure the global tx desc usage limit is honored by
direct switch as well.

Change-Id: Ie84edb08a8bd6c6a18338caf21328245bd70a8bc
CRs-Fixed: 3486130

dp/wifi3.0/dp_tx.c

@@ -5646,6 +5646,8 @@ dp_tx_comp_process_desc_list(struct dp_soc *soc,
 				nbuf = desc->nbuf;
 				dp_tx_nbuf_dev_queue_free_no_flag(&h, nbuf);
 				dp_tx_desc_free(soc, desc, desc->pool_id);
+
+				__dp_tx_outstanding_dec(soc);
 			} else {
 				nbuf = dp_ppeds_tx_desc_free(soc, desc);
 				dp_tx_nbuf_dev_queue_free_no_flag(&h, nbuf);