sunxi: move overlays from various patches into auto-patcher

[EvilOlaf]

Description

• overlays, their readmes and fixup scripts for sunxi and sunxi64 were spread across various (null)-patches
• they were moved into new overlay_32 and overlay_64 directories
• auto-patcher will handle the rest
• thanks to Ricardo for sharing the suffering 😁

This PR depends on #9204
Not sure if will apply as it is, perhaps some refactoring/cherry-picking or whatever those git wizards usually do is necessary.

left todo is re-recover the fixup scripts for armhf since all but for Allwinner A10 were lost somewhere between 6.15 and now.

How Has This Been Tested?

• build sunxi edge
• build sunxi64

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

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[github-actions]

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