qcacld-3.0: Fix get sap connected sta info fcs counter always 0

Stats event from target might have several sub events, and some event
has no peer stats but have adv/ext2 peer stats.

Check ext/ext2 peer stats even no peer stats in
target_if_cp_stats_extract_peer_stats(). Fix copy adv stats size error
in tgt_mc_cp_stats_prepare_n_send_raw_station_stats(). Although
get_station_stats_cb and get_peer_stats_cb is union callbacks,
better to assign to get_station_stats_cb because it is for
TYPE_STATION_STATS.

Change-Id: I0bead0cbb8b549cc538ef4a7327f0a8303c90bd1
CRs-Fixed: 2801842

components/target_if/cp_stats/src/target_if_mc_cp_stats.c

@@ -492,7 +492,7 @@ static QDF_STATUS target_if_cp_stats_extract_peer_stats(
 
 	/* Extract peer_stats */
 	if (!stats_param->num_peer_stats)
-		return QDF_STATUS_SUCCESS;
+		goto adv_stats;
 
 	ev->peer_stats = qdf_mem_malloc(sizeof(*ev->peer_stats) *
 						stats_param->num_peer_stats);
@@ -519,6 +519,7 @@ static QDF_STATUS target_if_cp_stats_extract_peer_stats(
 							TGT_NOISE_FLOOR_DBM;
 	}
 
+adv_stats:
 	target_if_cp_stats_extract_peer_extd_stats(wmi_hdl, stats_param, ev,
 						   data);