Relicense Yocto/OE-related files to MIT to align with Oniro core, REUSE compliance

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.

Fixes: #5 (closed)

Make the repository REUSE 3.0 compliant

• making the repository REUSE compliant adding SPDX headers to files that have no copyright and licensing information
• Remove unused Apache-2.0 license

# SUMMARY

* Bad licenses:
* Deprecated licenses:
* Licenses without file extension:
* Missing licenses:
* Unused licenses:
* Used licenses: CC-BY-4.0, MIT
* Read errors: 0
* Files with copyright information: 12 / 12
* Files with license information: 12 / 12

Congratulations! Your project is compliant with version 3.0 of the REUSE Specification :-)

Signed-off-by: Francesco Pham francesco.pham@huawei.com