Add initial support for i.MX8MM extension board

See merge request sw/ked/meta-kontron!11

This is required to compile overlays that can be loaded by U-Boot.

Upgrade to Kernel 6.1 and update to latest U-Boot revision

See merge request sw/ked/meta-kontron!10

Containerfile: Add jq and python-gitlab for CI job scripting

See merge request sw/ked/meta-kontron!5

Add Kirkstone support

See merge request sw/ked/meta-kontron!1

And allow to disable the debug-tweaks by using kas/production.yml.

With the layers in a single repo, we don't need layer-specific CI configs,
READMEs or license information anymore.

At the moment we don't want to upgrade to the 5.15 version from
the OpenST Linux Kirkstone release. Therefore let's add a copy
of the legacy recipe from Dunfell for now.

At the moment we don't want to upgrade to the 2021.10 version from
the OpenST Linux Kirkstone release. Therefore let's add a copy
of the legacy recipe from Dunfell for now.

At the moment we don't want to upgrade to the 2.6 version from
the OpenST Linux Kirkstone release. Therefore let's add a recipe
for the legacy version from Dunfell for now.

Add another reference to the path in Kirkstone so we can be compatible
with both, old and new releases.

Use the new SPDX names as done in later Yocto releases like Kirkstone.
A separate patch applied for Dunfell that backports the new license
names makes sure that we stay compatible with both releases.

Use the new SPDX names as done in later Yocto releases like Kirkstone.
A separate patch applied for Dunfell that backports the new license
names makes sure that we stay compatible with both releases.

We override the default value of UBOOT_ENTRYPOINT set in meta-freescale
to get rid of the alignment kernel boot warning. For this to work in both,
Dunfell and Kirkstone, we need to apply some fixes.