fix(xclk): Zero init ledc_channel_config_t for forward compatibility

[tore-espressif]

Description

LEDC driver was extended in espressif/esp-idf@4a90deb with new config structure members. We must zero init the config struct to get default behavior.

Related

• Needed because of espressif/esp-idf@4a90deb

Testing

Run esp32-camera example on S2 board.

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Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

[tore-espressif]

@me-no-dev PTAL! It would be good to release new esp32-camare soon, as it does not work with latest esp-idf master on S2

[me-no-dev]

merged and released 2.0.14