Add missed benchmark tool __init__.py files (#6919)

* add missed __init__.py files

* Update __init__.py

empty line

tools/benchmark_tool/openvino/__init__.py

@@ -0,0 +1,3 @@
+# Copyright (C) 2018-2021 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+__path__ = __import__('pkgutil').extend_path(__path__, __name__)

tools/benchmark_tool/openvino/tools/__init__.py

@@ -0,0 +1,3 @@
+# Copyright (C) 2018-2021 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+