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!
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[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)

[dleach02]

@theadib thankyou for the contributions. Can you address the compliance issue:

Commit message body line exceeds max length (85>75): "implements the set_config api for the eth_nxp_enet_qos_mac driver as in FRDM_MCXN947"