【USB】支持电脑休眠唤醒功能 - #117
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注意：此处修改会导致电脑休眠后，USB指示灯长亮，下一步应当通过Uart发送电脑处于休眠状态的信息，以便蓝牙主控获取信息后关闭USB指示灯。
1. 利用RESET_KEEP寄存器判断主机状态 USB枚举完成代表接入了正确的主机，此时将RESET_KEEP寄存器写入1，在重新断电上电RESET_KEEP清零之前，可认为CH552一直正确接入主机上 2. 未枚举完成不发送按键信息，以修正休眠唤醒过程中，卡按键的问题 3. 将休眠状态发送给主机（兼容老版本的PIN_CHARGING检测），主机可通过此信息关闭指示灯
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注意：此处修改会导致电脑休眠后，USB指示灯长亮，下一步应当通过Uart发送电脑处于休眠状态的信息，以便蓝牙主控获取信息后关闭USB指示灯。