RTEMS | Fix psxtests/psx05aio case fail (!462)

[yang zhang (@yang.zhang)]

yang zhang created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/462

Project:Branches: yang.zhang/rtems:fix_psxaio05_fail to rtems/rtos/rtems:main
Author:   yang zhang




## Summary
`lio_listio`'s `nent` should not exceed `AIO_LISTIO_MAX`.
There are two definitions for this macro `AIO_LISTIO_MAX`：
One is in `cpukit/include/rtems/posix/aio_misc.h`
`#ifndef AIO_LISTIO_MAX
#define AIO_LISTIO_MAX 20
#endif`
The other one is in toolchain `limits.h`
`#define AIO_LISTIO_MAX          2`

`init.c` would include many header files, such as 'cpukit/include/config.h', then `cpukit/include/rtems/libio_.h`, it would include 'limits.h', the `cpukit/include/rtems/posix/aio_misc.h` is behind of it, so `AIO_LISTIO_MAX` is `2` not `20`.

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