python3-homeassistant: Include HomeAssistant plugin through RRECOMMENDS

The plugin is used by Home Assistant in the Smart Home blueprint scenario
to communicate with IoT sensors and light switchd devices.

Instead of adding smart-home-homeassistant-plugin to installation
packages list, include it via RRECOMMENDS for HomeAssistant.

Signed-off-by: Wojciech Zmuda <wojciech.zmuda@huawei.com>
Signed-off-by: Zbigniew Bodek <zbigniew.bodek@huawei.com>
Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-ohos-blueprints/recipes-homeassistant/homeassistant/python3-homeassistant_%.bbappend

+# SPDX-FileCopyrightText: 2021 Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+RRECOMMENDS_${PN} += "smart-home-homeassistant-plugin"