feat: Tegra: refactor into subdirectory

The current layer is compatible with Jetpack 4, which
correlates with the L4T 32.x release family. A number of
boards are supported on this, for example
- Jetson TX2
- Jetson Nano
- ...
The newer release family Jetpack 5 correlating with L4T 35.x
introduces a number of breaking changes which cannot be folded
into the existing structure.
To prepare for the support of both families, this moves the
existing layer into a dedicated subdirectory, allowing additional
Tegra-specific layers to be added to the meta-mender-tegra
top level directory.

Changelog: Title
Ticket: None

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

kas/include/tegra.yml

@@ -15,7 +15,7 @@ repos:
 
   meta-mender-community:
     layers:
-      meta-mender-tegra:
+      meta-mender-tegra/meta-mender-tegra-jetpack4:
 
 local_conf_header:
   tegra: |

meta-mender-tegra/README.md → meta-mender-tegra/meta-mender-tegra-jetpack4/README.md

@@ -21,14 +21,14 @@ This layer depends on:
 ```
 URI: https://github.com/madisongh/meta-tegra.git
 layers: meta-tegra
-branch: dunfell-l4t-r32.4.3
+branch: kirkstone-l4t-r32.4.3
 revision: HEAD
 ```
 
 ```
 URI: https://github.com/mendersoftware/meta-mender.git
 layers: meta-mender-core
-branch: dunfell
+branch: kirkstone
 revision: HEAD
 ```
 

meta-mender-tegra/meta-mender-tegra-jetpack4/conf/layer.conf

@@ -0,0 +1,12 @@
+# We have a conf and classes directory, add to BBPATH
+BBPATH .= ":${LAYERDIR}"
+# We have recipes-* directories, add to BBFILES
+BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \
+		${LAYERDIR}/recipes-*/*/*.bbappend"
+
+BBFILE_COLLECTIONS += "meta-mender-tegra-jetpack4"
+BBFILE_PATTERN_meta-mender-tegra-jetpack4 = "^${LAYERDIR}/"
+BBFILE_PRIORITY_meta-mender-tegra-jetpack4 = "10"
+LAYERVERSION_meta-mender-tegra = "1"
+LAYERSERIES_COMPAT_meta-mender-tegra-jetpack4 = "kirkstone"
+LAYERDEPENDS_meta-mender-tegra-jetpack4 = "tegra"