That Android code is the official open-source AOSP (Android Open Source Project) code in https://cs.android.com/android/platform/superproject/main/+/main. And The VIM3 device specific code is here https://cs.android.com/android/platform/superproject/main/+/main:device/amlogic/yukawa/.
The AOSP main branch is the trunk development branch for the next dessert release, so the HEAD on the main branch is newer than any Android U releases.
From the log below, it looks like the Baylibre gerrit is using the Android 14 r15 release:
➜ khadas-aosp-14 repo init -u https://gitlab.baylibre.com/baylibre/amlogic/atv/aosp/manifest.git -b yukawa-android-14 --depth=1
Downloading Repo source from https://gerrit.googlesource.com/git-repo
You are automatically enrolled in Git submodules experiment (go/android-submodules-quickstart) for another two weeks.
NOTICE: --use-superproject is in beta; report any issues to the address described in `repo version`
/usr/local/google/home/wgtdkp/khadas-aosp-14/.repo/exp-superproject/925043f706ba64db713e9bf3b55987e2-superproject.git: Performing initial setup for superproject; this might take several minutes.
warning: git update of superproject failed, repo sync will not use superproject to fetch source; while this error is not fatal, and you can continue to run repo sync, please run repo init with the --no-use-superproject option to stop seeing this warning
Your identity is: Kangping Dong <wgtdkp@google.com>
If you want to change this, please re-run 'repo init' with --config-name
repo has been initialized in /usr/local/google/home/wgtdkp/khadas-aosp-14
➜ khadas-aosp-14 repo sync -j96
You are currently enrolled in Git submodules experiment (go/android-submodules-quickstart). Use --no-use-superproject to override.
NOTICE: --use-superproject is in beta; report any issues to the address described in `repo version`
repo superproject branch: android-14.0.0_r15 url: https://android.googlesource.com/platform/superproject warning: git fetch call failed, command: git ['fetch', 'https://android.googlesource.com/platform/superproject', '--depth', '1', '--force', '--no-tags', '--filter', 'blob:none', 'android-14.0.0_r15:android-14.0.0_r15'], return code: 128, stderr: fatal: couldn't find remote ref android-14.0.0_r15
Android Android 14 r15 is released in Sep 2023, it’s pretty old and doesn’t include my feature. See here refs/tags/android-14.0.0_r15 - platform/frameworks/base - Git at Google