Function create_kernel_thread 

pub fn create_kernel_thread<L>(
    locked: &mut Locked<L>,
    system_task: &Task,
    initial_name: TaskCommand,
) -> Result<CurrentTask, Errno>
where
    L: LockBefore<TaskRelease>,

Create a kernel task in the same ThreadGroup as the given system_task.

There is no underlying Zircon thread to host the task.