[device/celestica]: Add fwutil#2824

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mudsut4ke:add-fwutil

Commits on Apr 18, 2019

[platform/cel]: Add sysfs to read/write dx010 CPLD register
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[device/celestica]: Add platform-specific firmware management api
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Commits on Apr 19, 2019

[device/celestica]: Update code format
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Commits on Apr 26, 2019

[device/celestica] - Add fwutil base class
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