qcacld-3.0: Reduce mlme logging level from err to debug

In wlan_mlme_configure_chain_mask(),mlme_legacy_err is
updated to mlme_legacy_debug,as its not an error condition.

Change-Id: Ibdf33124ee970bcfcc9d57df9f3b3fc6990072fe
CRs-Fixed: 2599510

components/mlme/dispatcher/src/wlan_mlme_api.c

@@ -939,7 +939,7 @@ QDF_STATUS wlan_mlme_configure_chain_mask(struct wlan_objmgr_psoc *psoc,
 
 	if (enable2x2 || !enable_bt_chain_sep || as_enabled ||
 	   (!hw_dbs_2x2_cap && dual_mac_feature != DISABLE_DBS_CXN_AND_SCAN)) {
-		mlme_legacy_err("Cannot configure chainmask to FW");
+		mlme_legacy_debug("Cannot configure chainmask to FW");
 		return QDF_STATUS_E_FAILURE;
 	}