add vs6621s support in kernel

lin

2025-07-31 065ea569db06206874bbfa18eb25ff6121aec09b

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LIBANDROIDIO_1 {
  global:
    async_close_monitor_create;
    async_close_monitor_destroy;
    async_close_monitor_signal_blocked_threads;
    async_close_monitor_static_init;
    async_close_monitor_was_signalled;
 
  local:
    *;
};