qcacld-3.0: Fix the issue of mcs=255 in relatively high rate mode

Currently the RX link speed reported is taken from driver instead
of FW. In light of performance, driver will stop reporting rates
info when throughput exceeds certain threshold. In that case, the
rates info to be reported is from parsing the rateflags from FW.
However, driver sometimes fails to get an appropriate MCS index
and has to assign 0 to it, which has unfriendly user experience
when too much MCS=0 occurs. To address this issue, first, update
the logic to ignore the throughput judgement to make sure that
the rates info to be reported is always from driver. Second, add
the function wlan_hdd_get_peer_rx_rate_stats() where wma_get_mcs
_idx() has been called, to prevent the already updated rates info
from corrupting by FW due to multi-thread. This change has little
impact on throughput because the function is not called frequently.

Change-Id: I73e874caa8e77325c9e81d0e5929e1ba539946a5
CRs-Fixed: 3434764

core/hdd/src/wlan_hdd_stats.c

@@ -2091,6 +2091,7 @@ static void cache_station_stats_cb(struct stats_event *ev, void *cookie)
 			continue;
 		}
 		copy_station_stats_to_adapter(adapter, ev);
+		wlan_hdd_get_peer_rx_rate_stats(adapter);
 		/* dev_put has to be done here */
 		hdd_adapter_dev_put_debug(adapter, dbgid);
 		if (next_adapter)
@@ -7573,13 +7574,6 @@ void wlan_hdd_get_peer_rx_rate_stats(struct hdd_adapter *adapter)
 
 	soc = cds_get_context(QDF_MODULE_ID_SOC);
 
-	/*
-	 *  If througput is high, do not get rx rate
-	 *  info to avoid the performance penalty
-	 */
-	if (cdp_get_bus_lvl_high(soc))
-		return;
-
 	peer_stats = qdf_mem_malloc(sizeof(*peer_stats));
 	if (!peer_stats)
 		return;