shell: add option to disable pcspkr blacklisting

Unfortunately, there is a popular hoster that offers systems where blacklisting pcspkr results in a failure. Since these are virtual systems its not really relevant anyway. The simplest solution was to make it configurable.

Open to other solutions.

approved this merge request

added 3 commits

• 6ea723c0...53cf8286 - 2 commits from branch master
• 40c26b8c - shell: add option to disable pcspkr blacklisting

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enabled an automatic merge when the pipeline for 40c26b8c succeeds

merged