Added unique id to all Wink devices. (#18589)

homeassistant/components/wink/__init__.py

@@ -687,6 +687,11 @@ class WinkDevice(Entity):
         """Return the name of the device."""
         return self.wink.name()
 
+    @property
+    def unique_id(self):
+        """Return the unique id of the Wink device."""
+        return self.wink.object_id()
+
     @property
     def available(self):
         """Return true if connection == True."""