Use relative symbolic links for some BSP files

[retro98boy]

How Has This Been Tested?

Build the full imgs for these boards to make sure the compilation doesn't fail. Then use losetup to check if the symlinks inside the image are correct.

Summary by CodeRabbit

• Bug Fixes
  • Improved audio configuration setup during installation so the needed directories are created consistently.
  • Updated sound profile links to use more reliable relative paths, helping prevent missing or broken audio configuration on supported devices.

[coderabbitai]

📝 Walkthrough

Walkthrough

Three board configuration scripts modify their post_family_tweaks_bsp functions for ALSA UCM setup: directory creation switches from conditional (if [ ! -d ... ]) to unconditional mkdir -p, and symlink targets for sound-card conf files change from absolute paths to relative paths.

Changes

ALSA UCM directory and symlink updates

Layer / File(s)	Summary
Unconditional mkdir and relative symlinks config/boards/bestv-r3300-l.csc, config/boards/cainiao-cniot-core.csc, config/boards/norco-emb-3531.csc	Each board's post-install tweak now uses mkdir -p unconditionally for its ALSA UCM conf.d directory and creates the sound-card config symlink using a relative path instead of an absolute path.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested labels: Patches

Suggested reviewers: SuperKali, paolosabatino, HeyMeco

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: converting some BSP symlinks to relative paths.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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