Remove entity description mixin in Onvif (#112912)

homeassistant/components/onvif/switch.py

@@ -17,9 +17,9 @@ from .device import ONVIFDevice
 from .models import Profile
 
 
-@dataclass(frozen=True)
-class ONVIFSwitchEntityDescriptionMixin:
-    """Mixin for required keys."""
+@dataclass(frozen=True, kw_only=True)
+class ONVIFSwitchEntityDescription(SwitchEntityDescription):
+    """Describes ONVIF switch entity."""
 
     turn_on_fn: Callable[
         [ONVIFDevice], Callable[[Profile, Any], Coroutine[Any, Any, None]]
@@ -32,13 +32,6 @@ class ONVIFSwitchEntityDescriptionMixin:
     supported_fn: Callable[[ONVIFDevice], bool]
 
 
-@dataclass(frozen=True)
-class ONVIFSwitchEntityDescription(
-    SwitchEntityDescription, ONVIFSwitchEntityDescriptionMixin
-):
-    """Describes ONVIF switch entity."""
-
-
 SWITCHES: tuple[ONVIFSwitchEntityDescription, ...] = (
     ONVIFSwitchEntityDescription(
         key="autofocus",