fix(idf): support legacy FatFS VFS registration API

[YanKE01]

Description

ESP-IDF release/v5.5 is still widely used, so the esp_vfs_fat_register() call should remain compatible across different ESP-IDF versions.

The new esp_vfs_fat_register() API using esp_vfs_fat_conf_t is only available in ESP-IDF 6.0.1 and later. ESP-IDF 6.0.0 and earlier, including release/v5.5, still use the legacy four-argument API.

This PR selects the appropriate API according to ESP_IDF_VERSION, preserving compatibility with both mainstream ESP-IDF 5.5 releases and newer versions.

Summary by CodeRabbit

• Bug Fixes
  • Improved FAT filesystem compatibility across different ESP-IDF versions.
  • Ensured filesystem registration uses the appropriate configuration method for each supported version.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 10074418-6098-40a2-97a9-9d1870fd20e5

📥 Commits

Reviewing files that changed from the base of the PR and between af3a981 and 08cb6e4.

📒 Files selected for processing (1)

• platform/idf/usbh_fatfs.c

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📝 Walkthrough

Walkthrough

The FATFS registration code now includes ESP-IDF version information and selects the configuration-structure API for versions newer than 6.0. Older versions continue to use the legacy API.

Changes

ESP-IDF FATFS compatibility

Layer / File(s)	Summary
Versioned FATFS registration platform/idf/usbh_fatfs.c	The source includes esp_idf_version.h and selects the appropriate esp_vfs_fat_register call for the ESP-IDF version.

Estimated code review effort: 1 (Trivial) | ~4 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the change to support the legacy FatFS VFS registration API.
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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