deviceinfo: Fix not handling accept properly

On accept the profile shall check about existing attribute, etc and once
done call btd_service_connecting_complete updating the service state
properly.
diff --git a/profiles/deviceinfo/deviceinfo.c b/profiles/deviceinfo/deviceinfo.c
index 0c48f00..34d9e20 100644
--- a/profiles/deviceinfo/deviceinfo.c
+++ b/profiles/deviceinfo/deviceinfo.c
@@ -136,6 +136,8 @@
 	gatt_db_foreach_service(db, &deviceinfo_uuid,
 					foreach_deviceinfo_service, device);
 
+	btd_service_connecting_complete(service, 0);
+
 	return 0;
 }