Update platform_manager, fw_util, and fan_sensor configuration files.

[scottpaulsen]

• Updated platform_manager.json sync to open source, pmUnitName name change
• Updated fan_service.json compute set to 1, and high/low corrected
• Updated fw_util.json to match open source

Verified with the latest fboss built utilities.

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@scottpaulsen has updated the pull request. You must reimport the pull request before landing.