eth_nxp_enet_qos: implement set_config

[theadib]

implements the set_config api for the eth_nxp_enet_qos_mac driver as in FRDM_MCXN947

[github-actions]

Hello @theadib, and thank you very much for your first pull request to the Zephyr project!
Our Continuous Integration pipeline will execute a series of checks on your Pull Request commit messages and code, and you are expected to address any failures by updating the PR. Please take a look at our commit message guidelines to find out how to format your commit messages, and at our contribution workflow to understand how to update your Pull Request. If you haven't already, please make sure to review the project's Contributor Expectations and update (by amending and force-pushing the commits) your pull request if necessary.
If you are stuck or need help please join us on Discord and ask your question there. Additionally, you can escalate the review when applicable. 😊

[decsny]

Hi, the PR looks good at a glance, I will review more when I get a chance. For now make sure you ran the scripts/ci/check_compliance script and passed (expect clang format check is optional, the driver might already not pass clang format)