android 6.0/7.1 默认开启usb调试

路径：

\frameworks\base\services\usb\java\com\android\server\usb\UsbDeviceManager.java

修改：

原： 

Settings.Global.putInt(mContentResolver, Settings.Global.ADB_ENABLED, mAdbEnabled ? 1 : 0);

修改后：

Settings.Global.putInt(mContentResolver, Settings.Global.ADB_ENABLED, 1);

参考：

https://blog.youkuaiyun.com/huil0925/article/details/94883661