feat: Tegra: update Readme

The Readme file and repo scripts for meta-mender-tegra still
referred to the dunfell and zeus releases. As we now provide
kas configurations for all supported boards in this layer,
note those in the Readme and remove the outdated information.

Changelog: Title
Ticket: None

Signed-off-by: Josef Holzmayr <jester@theyoctojester.info>

meta-mender-tegra/README.md

@@ -19,26 +19,40 @@ together with Mender for the mentioned boards.
 This layer depends on:
 
 ```
-URI: https://github.com/madisongh/meta-tegra.git
+URI: https://github.com/OE4T/meta-tegra.git
 layers: meta-tegra
-branch: dunfell-l4t-r32.4.3
+branch: kirkstone-l4t-r32.7.x
 revision: HEAD
 ```
 
 ```
 URI: https://github.com/mendersoftware/meta-mender.git
 layers: meta-mender-core
-branch: dunfell
+branch: kirkstone
 revision: HEAD
 ```
 
-
 ## Quick start
 
 See the mender hub pages and the documentation for the `tegrademo-mender`
 distro on the [tegra-demo-distro](https://github.com/OE4T/tegra-demo-distro) repository
 for the most up to date instructions on starting out with mender and tegra.
 
+## [`kas`](https://github.com/siemens/kas) configurations
+
+The following configuration files for building using the `kas` tool are provided:
+
+- [jetson-agx-xavier-devkit.yml](../kas/jetson-agx-xavier-devkit.yml)
+- [jetson-nano-2gb-devkit.yml](../kas/jetson-nano-2gb-devkit.yml)
+- [jetson-nano-devkit-emmc.yml](../kas/jetson-nano-devkit-emmc.yml)
+- [jetson-nano-devkit.yml](../kas/jetson-nano-devkit.yml)
+- [jetson-tx2-devkit-4gb.yml](../kas/jetson-tx2-devkit-4gb.yml)
+- [jetson-tx2-devkit-tx2i.yml](../kas/jetson-tx2-devkit-tx2i.yml)
+- [jetson-tx2-devkit.yml](../kas/jetson-tx2-devkit.yml)
+- [jetson-xavier-nx-devkit-emmc.yml](../kas/jetson-xavier-nx-devkit-emmc.yml)
+- [jetson-xavier-nx-devkit-tx2-nx.yml](../kas/jetson-xavier-nx-devkit-tx2-nx.yml)
+- [jetson-xavier-nx-devkit.yml](../kas/jetson-xavier-nx-devkit.yml)
+
 ## Acknowlegements
 
 Special thanks to [Matt Madison](https://github.com/madisongh) for his contributions to