feat(openthread): use the actual receive sensitivity for link quality evaluation

components/ieee802154/include/esp_ieee802154.h

@@ -39,6 +39,14 @@ esp_err_t esp_ieee802154_enable(void);
  */
 esp_err_t esp_ieee802154_disable(void);
 
+/**
+ * @brief  Get the receive sensitivity.
+ *
+ * @return The receive sensitivity in dBm.
+ *
+ */
+int8_t esp_ieee802154_get_receive_sensitivity(void);
+
 /**
  * @brief  Get the operational channel.
  *