qcacld-3.0: Disable legacy rates in 6 GHz frequency band

Disable 11a support on 6 GHz band and change default rate of 6 GHz
frequency band by using WMI_PDEV_PARAM_DEFAULT_6GHZ_RATE.

Change-Id: I2db2dd54c03cf71e1b697796fa3dc58d2646a8b5
CRs-Fixed: 3251997

components/mlme/core/src/wlan_mlme_main.c

@@ -593,6 +593,8 @@ static void mlme_init_generic_cfg(struct wlan_objmgr_psoc *psoc,
 	gen->monitor_mode_concurrency =
 		cfg_get(psoc, CFG_MONITOR_MODE_CONCURRENCY);
 	gen->tx_retry_multiplier = cfg_get(psoc, CFG_TX_RETRY_MULTIPLIER);
+	gen->enable_he_mcs0_for_6ghz_mgmt =
+		cfg_get(psoc, CFG_ENABLE_HE_MCS0_MGMT_6GHZ);
 	mlme_init_wds_config_cfg(psoc, gen);
 	mlme_init_mgmt_hw_tx_retry_count_cfg(psoc, gen);
 	mlme_init_relaxed_6ghz_conn_policy(psoc, gen);