qca-wifi: Fix for incorrect channel frequency in radio tap

Channel frequency was shown as 0 in radio tap header for
tx capture feature.

Change-Id: Iae60770e59603a1d6056be649178fcdee26c1455
CRs-Fixed: 2621057

dp/wifi3.0/dp_tx_capture.c

@@ -3401,6 +3401,8 @@ static void set_mpdu_info(
 	mpdu_info = &tx_capture_info->mpdu_info;
 	mpdu_info->ppdu_start_timestamp = rx_status->tsft + 16;
 	mpdu_info->channel_num = rx_status->chan_num;
+	mpdu_info->channel = rx_status->chan_freq;
+
 	mpdu_info->bw = 0;
 
 	if  (mpdu_info->channel_num < 20)