RTEMS | termios: Handle B0 baud rate in tcsetattr (!1564)

[SHIVAM DEOLANKAR (@D3athSkulll)]

SHIVAM DEOLANKAR created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1564

Project:Branches: D3athSkulll/rtems:fix-b0-baudrate to rtems/rtos/rtems:main
Author: SHIVAM DEOLANKAR

## Summary

Reject B0 output baud rate requests with ENOTSUP before updating terminal attributes or invoking the device driver.

Update termios01 tests to verify B0 rejection and preserve normal baud rate configuration.

Fixes #5558

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1564
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