[Armbian build PR] - khadas-edge2: very initial patches from Khadas tree, rebased on top of Radxa/rk3.4

I have started this months ago, but due to high demand from other subjects (armbian-next) haven't had time to finish.

What I did here was take Khadas tree (.66) and rebase it on top of rk3.4/Radxa tree (.110) for the rock-5b, similar to what was done for the OrangePi5. Some patches conflicted and I intervened (those are marked as intervention).

This needs review, a board file, a developer with the new Khadas I/O board for UART, and some luck, patience to fix my mistakes, and might just work. Who knows? If it's useless just bin this...

There's two patch files, one with stuff I deemed "required" and other with stuff "might be nice". The MCU stuff of Khadas is heavily entwined in there...

The complete git tree with those patches is at

• summary: https://rpardini.github.io/linux/armbian_rockchip_rk3588_legacy_with_initial_kedge2_20230203.html
• git tree: https://github.com/rpardini/linux/tree/armbian_rockchip_rk3588_legacy_with_initial_kedge2_20230203

Pinging @150balbes who @igorpecovnik told me might be working the kedge2...

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