qcacmn: Add mpdu tx retries stats

Customer reported their HLOS LTE-WLAN transition algo sometimes go wrong
for wrong low layer stats, Txretry delta is bigger than Txtotal delta.
Txretry unit is msdu while Txtotal unit is mpdu.

Add vdev/peer stats for mpdu number of successfully transmitted after
more than one retransmission attempt, to align mpdu tx_packets, tx_failed.

CRs-Fixed: 3099490
Change-Id: Id4b9d8fd81af4bf0c141dad481bfd2b3f6c1db2a

dp/wifi3.0/dp_tx.c

@@ -3783,10 +3783,12 @@ dp_tx_update_peer_stats(struct dp_tx_desc_s *tx_desc,
 	DP_STATS_INCC(peer, tx.stbc, 1, ts->stbc);
 	DP_STATS_INCC(peer, tx.ldpc, 1, ts->ldpc);
 	DP_STATS_INCC(peer, tx.retries, 1, ts->transmit_cnt > 1);
-	if (ts->first_msdu)
+	if (ts->first_msdu) {
+		DP_STATS_INCC(peer, tx.retries_mpdu, 1, ts->transmit_cnt > 1);
 		DP_STATS_INCC(peer, tx.mpdu_success_with_retries,
 			      qdf_do_div(ts->transmit_cnt, DP_RETRY_COUNT),
 			      ts->transmit_cnt > DP_RETRY_COUNT);
+	}
 	peer->stats.tx.last_tx_ts = qdf_system_ticks();
 }