rk322x: convert dtb patches to dt/overlay directories, support more boards

[paolosabatino]

Description

This PR will convert the existing dtb and dtbo patches into dt/overlay directories as in rockchip64 and other families for easier future handling of device trees.
Also fixes a weird u-boot bug for device tree overlays and bring full support for R29_MXQ, R2B_MXQ and H20 boards.

No other families other than rk322x have been touch by this PR.

How Has This Been Tested?

• Debian Bookworm images built and tested on live machine
• Compiled current kernel 6.1 and tested on live installation

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
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[rpardini]

Hey @paolosabatino, thanks

• I think we can't have rk322x-fixup.scr in git (it is built from rk322x-fixup.scr-cmd, hopefully) and included in .gitignore -- it is not a problem, really, but would make rewriting fail later.

I've noticed the "Makefile Autopatcher" is gagging on arch/arm/boot/dts/rockchip/Makefile's layout -- it's a single make rule (with many line continuations) and that confuses my parser (which I naively tested only on arm64, which uses one-rule-per-dtb), I'll work this so we can get rid of the 2 Makefile patches, and later enjoy automatic patch rebasing/rewriting -- I'll let you know.

[paolosabatino]

@rpardini Thanks a lot for spotting the .scr file; I removed that from the repo. Honestly, was also unaware of its purpose, reading the .scr-cmd file content was illuminating 😸

[rpardini]

Honestly, was also unaware of its purpose

Oh, and I didn't even realize it was empty. Good thing, fixups (prevalent in rockchip/rockchip64 etc) tie us down to booting via u-boot bootscripts.

Let's merge this, I'll send quality of life improvements later...