Prints out device model and instance id if defined

Bug: 70533914
Change-Id: I670b0fb09391bb7d3c6ee9af9a01064935bb58d1

Author: Fleker

google-assistant-sdk/googlesamples/assistant/grpc/pushtotalk.py

@@ -371,6 +371,9 @@ def onoff(on):
                 device = json.load(f)
                 device_id = device['id']
                 device_model_id = device['model_id']
+                logging.info("Using device model %s and device id %s",
+                             device_model_id,
+                             device_id)
         except Exception as e:
             logging.warning('Device config not found: %s' % e)
             logging.info('Registering device')