rk3566: add Anbernic RG DS Plus support

[beebono]

Summary

• What is the goal of this PR? (e.g. Bump up an emulator version, implement a new feature. )

Adds support for the Anbernic RG DS Plus as an RK3566 device target.

Testing

• How was this tested? (e.g. Built and tested on specific devices, manual testing steps, URLs for CI/CD build artifacts.)

All controls, hall-sensor sleep/wake, audio, LEDs, touchscreen, wifi, bluetooth, both LCD panels, both sd card slots, and both usb ports confirmed to work in EmulationStation and DraStic.

• Test results: (e.g. Screenshots, logs, performance metrics if applicable.)

Additional Context

• Add any other information that might be helpful for the reviewer (e.g., performance implications, potential risks, specific areas to focus on.)

Needs PR #10 in extra-firmware to be complete, package.mk for it will be amended properly once merged.

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AI Usage

While ROCKNIX doesn't have restrictions on AI tools in contributing, please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? YES
Claude Code was used to help with audio bring-up.

[beebono]

Additional testing in RetroArch and other standalones came back clean with control mapping and expected performance. Clear for review, unable to merge until extra-firmware is accepted and I can bump the version/sha256.

[beebono]

extra-firmware package.mk bumped and rebased onto next, my CI for RK3566 at https://github.com/beebono/distribution/actions/runs/35013030499 is running now. Local build succeeded, but just making sure.

[spycat88]

Please address changes and I'm happy to merge, thanks for a great PR

[beebono]

Changes addressed, swapped audio patch from adding the OF table for the module to failing fast on the firmware check when not found and retrying for up to a minute when audio is actually being set up for the speakers.