luckfox-lyra-ultra-w: Add spidev overlay with 2 CS

[vidplace7]

Adds spidev overlay with 2 chipselect lines for Luckfox Lyra Ultra, mirroring raspberry-pi placement (Lyra Ultra pinout mirrors the first 26pins of a raspberry pi)

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: bb2d0643-2d62-457f-9270-d4e555c11b80

📥 Commits

Reviewing files that changed from the base of the PR and between d7ef26f and 1e41300.

📒 Files selected for processing (3)

• arch/arm/boot/dts/overlay/Makefile
• arch/arm/boot/dts/overlay/README.rockchip-overlays
• arch/arm/boot/dts/overlay/rockchip-luckfox-lyra-ultra-w-spi0-2cs-spidev.dts

✅ Files skipped from review due to trivial changes (2)

• arch/arm/boot/dts/overlay/README.rockchip-overlays
• arch/arm/boot/dts/overlay/Makefile

🚧 Files skipped from review as they are similar to previous changes (1)

• arch/arm/boot/dts/overlay/rockchip-luckfox-lyra-ultra-w-spi0-2cs-spidev.dts

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Walkthrough

Adds a Luckfox Lyra Ultra W SPI0 spidev overlay with two chip selects, explicit RM_IO pinmux settings, SPI0 enabled, and two spidev child nodes. The overlay README is updated to list the new option and describe it.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: adding a two-CS spidev overlay for Luckfox Lyra Ultra-W.
Description check	✅ Passed	The description is related to the change and correctly describes adding a two-chip-select spidev overlay.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@arch/arm/boot/dts/overlay/rockchip-luckfox-lyra-ultra-w-spi0-2cs-spidev.dts`:
- Around line 1-39: The new SPI0 spidev overlay is defined in the DTS but is not
being built because it is missing from the overlay Makefile. Update
arch/arm/boot/dts/overlay/Makefile to add
rockchip-luckfox-lyra-ultra-w-spi0-2cs-spidev.dtbo to the overlay build list so
the new overlay is compiled and shipped, matching the README and the DTS entry.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 522c9280-8904-4b4e-bdea-ed788705e9d3

📥 Commits

Reviewing files that changed from the base of the PR and between 95e85f6 and d7ef26f.

📒 Files selected for processing (2)

• arch/arm/boot/dts/overlay/README.rockchip-overlays
• arch/arm/boot/dts/overlay/rockchip-luckfox-lyra-ultra-w-spi0-2cs-spidev.dts