Switch license to MIT

we want MIT license in yocto meta layers, to align with Oniro Core. Therefore we need to switch from Apache-2.0 to MIT license, including SPDX headers.

The Oniro repository changed license of all Yocto/OE build system meta-data/files/patches from Apache to MIT to make collaboration with the upstream easier: eclipse/oniro-core/oniro#824 (closed)

Relicense all files in this repository to MIT to align with Oniro core.

Due to how these Yocto/OE layers interact with upstream layers (including oe-core), having parts of our layers licensed under Apache when most (if not all) of our upstream dependencies (and generally the entire ecosystem) are MIT, would pose a couple of issues:

• Using our layers would introduce a new license to a downstream consumer that needs to be assessed.
• Reusing parts of our code would pose an issue of relicensing on Oniro or the downstream side.
• Upstreaming Apache code would need relicensing on the Oniro side before upstream could accept contributions (unless upstream is up for a license addition which in most cases is not an option).
• Mistakes can happen and end up with "silent" relicensing in different situations.

To avoid all the above we propose to change all the existing Yocto/OE Apache-2.0 files in this repository to MIT.

Signed-off-by: Stefan Schmidt stefan.schmidt@huawei.com