把Device trait的set_class改为设置Weak指针，以避免循环引用问题。 #666
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dragonosbot
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tty驱动发生了更改，请进行审查 cc @GnoCiYeH |
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Class里面存储的是设备的Arc，而Device又要求设备存储Class的Arc，这会导致循环引用，出现潜在的问题。