Add unit and device class to ZHA RSSI sensor (#85390)

* Add unit device class to ZHA RSSI sensor

* Remove unit and device class for LQI

* mypy

* isort

* mypy2

* Update sensor.py

homeassistant/components/zha/sensor.py

@@ -21,6 +21,7 @@ from homeassistant.const import (
     CONCENTRATION_PARTS_PER_MILLION,
     LIGHT_LUX,
     PERCENTAGE,
+    SIGNAL_STRENGTH_DECIBELS_MILLIWATT,
     Platform,
     UnitOfApparentPower,
     UnitOfElectricCurrent,
@@ -834,6 +835,8 @@ class RSSISensor(Sensor, id_suffix="rssi"):
     """RSSI sensor for a device."""
 
     _attr_state_class: SensorStateClass = SensorStateClass.MEASUREMENT
+    _attr_device_class: SensorDeviceClass | None = SensorDeviceClass.SIGNAL_STRENGTH
+    _attr_native_unit_of_measurement: str | None = SIGNAL_STRENGTH_DECIBELS_MILLIWATT
     _attr_entity_category = EntityCategory.DIAGNOSTIC
     _attr_entity_registry_enabled_default = False
     _attr_should_poll = True  # BaseZhaEntity defaults to False
@@ -868,6 +871,8 @@ class LQISensor(RSSISensor, id_suffix="lqi"):
     """LQI sensor for a device."""
 
     _attr_name: str = "LQI"
+    _attr_device_class = None
+    _attr_native_unit_of_measurement = None
 
 
 @MULTI_MATCH(