mwifiex: update amsdu tx packet time stamp

This patch fixes the issue of delay time in A-MSDU tx packet.
In generated new A-MSDU packet, the time stamp is initialized to zero.
Choose the time of first MSDU packet as aggregated packet's time.
Signed-off-by: Zhaoyang Liu <liuzy@marvell.com>
Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/mwifiex/11n_aggr.c

@@ -202,6 +202,7 @@ mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
 		tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
 	tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_AGGR_PKT;
 	skb_aggr->priority = skb_src->priority;
+	skb_aggr->tstamp = skb_src->tstamp;
 
 	do_gettimeofday(&tv);
 	skb_aggr->tstamp = timeval_to_ktime(tv);