Rftrx force update (#37944)

* Make sure sensor and binary_sensor force update

This make sure it's possible to react to events on all updates.

* Correct addition of binary sensors

homeassistant/components/rfxtrx/sensor.py

@@ -178,6 +178,16 @@ class RfxtrxSensor(RestoreEntity):
         """Return the unit this state is expressed in."""
         return self._unit_of_measurement
 
+    @property
+    def should_poll(self):
+        """No polling needed."""
+        return False
+
+    @property
+    def force_update(self) -> bool:
+        """We should force updates. Repeated states have meaning."""
+        return True
+
     @property
     def device_class(self):
         """Return a device class for sensor."""