Add support for real-time kernel headers path

[ejalberti]

This commit adds real-time kernel headers path to the list of potential locations for kernel configuration files.

This change ensure that NFD worker can correctly identify feature and avoid error messages, by adding two new patterns on possible paths for kernel information.

Closes: #2357

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• ✅ login: ejalberti / name: Eduardo Alberti (0808532)

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ejalberti
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