youyeetoo-yy3588: promote from CSC to standard support

[SuperKali]

Description

Promote youyeetoo-yy3588 from .csc to .conf: Youyeetoo has become an Armbian Gold partner for this board, so it moves to standard support.

No functional changes, file rename only.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code

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[github-actions]

✅ This PR has been reviewed and approved — all set for merge!