Revert "renamed add_devices to async_add_devices according to hass naming scheme (#9485)" (#9503)

This reverts commit a5a970709f.

tests/components/binary_sensor/test_spc.py

@@ -54,7 +54,7 @@ def test_setup_platform(hass):
 
     yield from spc.async_setup_platform(hass=hass,
                                         config={},
-                                        async_add_devices=add_entities,
+                                        async_add_entities=add_entities,
                                         discovery_info=zones)
 
     assert len(added_entities) == 3