feat: Add /dev/quickstart to support synchronous communication between processes in user mode startup.

Add /dev/quickstart to support synchronous communication between processes in user mode startup.
Support ioctl cmd:
QUICKSTART_LISTEN,QUICKSTART_STAGE1,QUICKSTART_STAGE2,QUICKSTART_STAGE3,QUICKSTART_UNREGISTER only for init process;
QUICKSTART_NOTIFY for other app process.

Close #I3OHO5:新增/dev/quickstart节点，作为用户态根进程与其他进程的启动同步通信节点

Change-Id: If6a56123be93a5bc6b6d1069abda8d872b15fae1

-----来自 commit 46b63f7