RDKBDEV-3396: Adding "WanFailoverData" Parameter definition in data m…

[satish-kotapati]

Reason for change: providing definition for missing parameter
Risks: None

[github-actions]

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[satish-kotapati]

Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

I have read the CLA Document and I hereby sign the CLA

You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.

I have read the CLA Document and I hereby sign the CLA