Use new CONF_MODEL core constant (2/3) (#68831)

* Use CONF_MODEL in xiaomi_miio

* Use CONF_MODEL in xiaomi

Co-authored-by: epenet <epenet@users.noreply.github.com>

homeassistant/components/xiaomi_miio/sensor.py

@@ -28,6 +28,7 @@ from homeassistant.const import (
     CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
     CONCENTRATION_PARTS_PER_MILLION,
     CONF_HOST,
+    CONF_MODEL,
     CONF_TOKEN,
     LIGHT_LUX,
     PERCENTAGE,
@@ -49,7 +50,6 @@ from .const import (
     CONF_DEVICE,
     CONF_FLOW_TYPE,
     CONF_GATEWAY,
-    CONF_MODEL,
     DOMAIN,
     KEY_COORDINATOR,
     KEY_DEVICE,