[Armbian build PR] - Add Libre Computer Alta and Solitude

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Description

Alta tested OK, Solitude not tested (hence "WIP")

Documentation summary for feature / change

Add Libre Computer A311D and S905D3 boards

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] My changes generate no new warnings

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