These instructions will help you prepare linaro vendor-package for AOSP:
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* Download the sources:
    $ git clone git@gitlab.com:LinaroLtd/linaro-aosp/linaro-vendor-package

* Do the desired changes with detailed commit messages and send the patches
  to device/linaro/dragonboard project maintainers.

* Prepare a new vendor-package:
    $ cd linaro-vendor-package
    $ ./generate_vendor_package.sh # This script will prepare a new vendor-package at
                                     at out/extract-linaro_devices-$YYYYMMDD.tgz

  New vendor package extract-linaro_devices-$YYYYMMDD.tgz is now ready.

* Raise a ticket with STG to upload the new package at
  https://releases.linaro.org/android/aosp-linaro-vendor-package/extract-linaro_devices-$YYYYMMDD.tgz
  For example:
    https://linaro.atlassian.net/browse/STG-3726

* Submit vendor-package updates on internal partner gerrit.
  For example:
    https://partner-android-review.googlesource.com/c/platform/vendor/linaro/db845c/+/2310830
    https://partner-android-review.googlesource.com/c/platform/vendor/linaro/rb5/+/2310829
    https://partner-android-review.googlesource.com/c/platform/vendor/linaro/linux-firmware/+/2310750

  Contact device/linaro/dragonboard project maintainers if you don't have access
  to the partner gerrit.

* Submit AOSP gerrit changes for Dragonboards and Hikey to use the new package.
  For example:
    https://android-review.googlesource.com/c/device/linaro/dragonboard/+/2252435
    https://android-review.googlesource.com/c/device/linaro/hikey/+/2260262