Mekotronics R58HD - add initial support

[igorpecovnik]

Description

Boot log:
https://paste.armbian.com/ifazujexow

Depending on: armbian/linux-rockchip#401

How Has This Been Tested?

• Build and boot
• HDMI OUT1
• HDMI OUT2
• HDMI OUT3
• HDMI OUT4
• HDMI OUT5
• HDMI OUT6

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch mekotronic-r58-hd

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