qcacld-3.0: Add new roam scan type string

Add new roam_scan type string to indicate all the 5G+6G
channels are scanned.

Change-Id: I8f77b9b28d5b544d586612e177c86a3b730b0bd9
CRs-Fixed: 2947645

components/mlme/dispatcher/src/wlan_mlme_api.c

@@ -3858,6 +3858,8 @@ char *mlme_get_roam_scan_type_str(uint32_t roam_scan_type)
 		return "FULL";
 	case 2:
 		return "NO SCAN";
+	case 3:
+		return "Higher Band";
 	default:
 		return "UNKNOWN";
 	}