ext/hal/st: stm32cube: Update License Link for stm23cube packages

[erwango]

License link provided in stm32cube abstract packages was not
reflecting the actual license in use for these packages.
Update the link to BSD 3-Clause official.

Signed-off-by: Erwan Gouriou erwan.gouriou@linaro.org

[nashif]

@erwango please rebase

[backporting]

The backport to v1.14-branch failed:

Commits ["04736283e828edf64e83bee43d184a49350bdbdf"] could not be cherry-picked on top of v1.14-branch

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub.
git fetch
# Create new working tree.
git worktree add .worktrees/backport v1.14-branch
# Navigate to the new directory.
cd .worktrees/backport
# Cherry-pick all the commits of this pull request and resolve the likely conflicts.
git cherry-pick 04736283e828edf64e83bee43d184a49350bdbdf
# Create a new branch with these backported commits.
git checkout -b backport-15731-to-v1.14-branch
# Push it to GitHub.
git push --set-upstream origin backport-15731-to-v1.14-branch
# Go back to the original working tree.
cd ../..
# Delete the working tree.
git worktree remove .worktrees/backport

Then, create a pull request where the base branch is v1.14-branch and the compare/head branch is backport-15731-to-v1.14-branch.