RDKCOM-5556: 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]

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[AkhilaReddyK7]

Ticket for tracking : https://ccp.sys.comcast.net/browse/RDKCOM-5556

[Copilot]

Pull request overview

Adds support in the TR-181 DML layer for the WanFailoverData string parameter so GET calls return a defined value (empty string), matching the existing pattern used for Data.

Changes:

• Added WanFailoverData handling in WanManager_GetParamStringValue() to return an empty string on GET.

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