fix: cannot open gpio on Raspberry Pi 4

[EnableAsync]

issue: #114

[kubeedge-bot]

Welcome @EnableAsync! It looks like this is your first PR to kubeedge/examples 🎉

[RyanZhaoXB]

lgtm. it seems that the vendor folder should be deprecated.

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lgtm. it seems that the vendor folder should be deprecated.

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[RyanZhaoXB]

@fisherxu please help to review this pr. thanks.