实现了rtc的抽象,并且把x86的cmos rtc接入到设备驱动模型 #674
Merged
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提供了rtc device的trait,每个具体的时钟设备都需要实现这个trait.
并且,设计了GeneralRtcDevice这个结构,提供对外的统一接口,它的父级设备是真实的rtc设备。
issue: #656