add vs6621s support in kernel

lin

2025-07-31 065ea569db06206874bbfa18eb25ff6121aec09b

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target_thread is sleeping in a wait.
Suspend target_thread.
Wake up the target_thread.
target_thread is sleeping in suspend without lock.
target_thread.isAlive() = true
resumed target_thread
target_thread doesn't hold lock!