Change project license back to Apache 2.0 from MIT (and CC-BY-4 for graphical assets)
The project has originally been licensed under Apache 2.0. In commit 3ce0ec86 this was changed to MIT by accident. This commits brings back the old license and clarifies the SPDX headers for it.
All contributions up to now have been done under Huawei Inc. copyright, which allows this license change.
Signed-off-by: Stefan Schmidt stefan.schmidt@huawei.com