RTEMS | mvme3100 fixes (!541)

[Jeremy Lorelli (@jjl77)]

Jeremy Lorelli created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/541

Project:Branches: jjl77/rtems:pr-fix-mvme3100 to rtems/rtos/rtems:main
Author:   Jeremy Lorelli




## Summary

The ds1375 driver was using the /dev/ interface for i2c. Since drivers get initialized so early, it was actually opening a file in /dev/ before stdin/stdout/stderr had been opened. 

By the time `rtems_libio_post_driver` is run to open stdin/stdout/stderr, file no. 0 has been allocated to the ds1375 driver. The logic in `rtems_libio_post_driver` also assumes that `open(/dev/console) != STDIN_FILENO` just means that the BSP has been configured without a console driver. This results in the BSP behaving as if it has been configured without a console driver (all standard streams are closed).

This MR contains the following changes:
* Refactor ds1375 driver to use i2c-rtc driver instead.
* Check if open(/dev/console) actually fails or if it gives us an unexpected file number. If it gives us an unexpected file number, raise an internal error.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/541
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