qcacmn: Add support for PPDU ACK timestamp

Make Ack timestamp same as PPDU END timestamp

Change-Id: I4030f461ed19d46e176819168ceca735c7c63f9f

dp/wifi3.0/dp_htt.c

@@ -1641,6 +1641,8 @@ static void dp_process_ppdu_stats_common_tlv(struct dp_pdev *pdev,
 
 	ppdu_desc->ppdu_end_timestamp = ppdu_desc->ppdu_start_timestamp +
 					ppdu_desc->tx_duration;
+	/* Ack time stamp is same as end time stamp*/
+	ppdu_desc->ack_timestamp = ppdu_desc->ppdu_end_timestamp;
 
 	tag_buf++;