Description

This adds mainline support for the Radxa Zero 3 (E variant at least) SBC by utilizing kwiboo's patch series for both Linux and U-Boot.

How Has This Been Tested?

Test device: Zero 3E 2GB

• [x] build edge
• [x] boot edge http://paste.armbian.com/osofoyuqun.yaml
• [x] build vendor
• [x] boot vendor https://paste.armbian.com/lejunireni.yaml

Issues:

This PR cannot be merged as it is since I have no idea what I am doing so

• the kernel patchset lacks proper headers. I had to strip those since the framework did not accept the patch series as they were. I don't know how to fix. Those need to be restored to give proper credit. Source: https://patchwork.kernel.org/project/linux-arm-kernel/cover/20240521202810.1225636-1-jonas@kwiboo.se/
• this only works for the 3E variant but not for 3W since the vendor variant is a combination of both but mainline provides separate dtbs. This needs attention/workaround as well.
• BOOTPATCHDIR is just fake so no patches are applied on top of upstream sources. I assume there is a more pretty way to solve this.

Raising anyways to create awareness and maybe anyone wants to pick it up and fix things. Feel free to commit adjustments here and bring it in good shape.

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