Add Marvell 88E1XXX driver for x86-64

[sairon]

Add driver for Marvell PHYs, such as 88E1543(4L) on an ASRock C3758D4I-4L board. Adding it to x86 config only, as it seems it's not widely used anywhere else.

Fixes #4025

Summary by CodeRabbit

• New Features
  • Enabled support for Marvell PHY network devices.
• Style
  • Improved organization of kernel configuration options with clearer comments.

[coderabbitai]

📝 Walkthrough

Walkthrough

The kernel configuration file for the generic x86-64 board was updated by adding a comment to clarify pin control support and enabling the Marvell PHY driver as a loadable module. No existing configuration options were removed or changed.

Changes

File(s)	Change Summary
buildroot-external/board/pc/generic-x86-64/kernel.config	Added comment for pin control support; enabled CONFIG_MARVELL_PHY=m

Assessment against linked issues

Objective	Addressed	Explanation
Enable Marvell PHY driver to support Marvell 88E1543(4L) NIC detection (#4025)	✅

Assessment against linked issues: Out-of-scope changes

No out-of-scope changes found.

---

📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro
Cache: Disabled due to data retention organization setting
Knowledge Base: Disabled due to data retention organization setting

📥 Commits

Reviewing files that changed from the base of the PR and between 5e36e68 and 0d5c915.

📒 Files selected for processing (1)

• buildroot-external/board/pc/generic-x86-64/kernel.config (1 hunks)

🔇 Additional comments (2)

buildroot-external/board/pc/generic-x86-64/kernel.config (2)

166-168: Section header for pin control
Grouping CONFIG_PINCTRL_CANNONLAKE=m under a "Pin control support" comment enhances readability and maintainability.

---

169-171: ```shell
#!/bin/bash
cfg="buildroot-external/board/pc/generic-x86-64/kernel.config"

echo "=== CONFIG_MODULES setting ==="
grep -E "^CONFIG_MODULES=[ym]" -n "$cfg" || echo "❌ CONFIG_MODULES not set to y or m"

echo "=== MDIO support settings ==="
grep -E "^CONFIG_MDIO(|_.)=(y|m)" -n "$cfg" || echo "❌ No MDIO support found (CONFIG_MDIO, CONFIG_MDIO_BUS, etc.)"

</details>

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[agners]

I guess this are mostly PCIe devices? I'd suggest to add it to buildroot-external/kernel/v6.12.y/device-support-pci.config, we already have CONFIG_BROADCOM_PHY=m there. Just in case someone passthrough a NIC..

[agners]

Actually, it seems that this is a rather odd quad-gigabit PHY, and the MAC is built into the Atom SoC

So at least in this case, this is not related to PCIe at all. It could be that Marvell PHYs are required for PCIe Ethernet controllers, but I guess we can move it if that comes up. So fine by me as is.

[sairon]

Yes, I reached the same conclusion. device-support-pci.config is incorrect, device-support.config too broad.