RTEMS | iospace: Add iospace driver (!1243)

[Kinsey Moore (@opticron)]

Kinsey Moore started a new discussion on cpukit/include/dev/iospace/iospace.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1243#note_150042

 > +
 > +/**
 > + * @brief Unregister the iospace device.
 > + *
 > + * @param[in] iospace The iospace device.
 > + *
 > + * @retval 0 Successful operation.
 > + * @retval non-zero Failed operation.
 > + */
 > +int rtems_iospace_unregister( const char *iospace_path );
 > +
 > +/**
 > + * @brief Destroys the iospace device.
 > + *
 > + * This function must only be used on rtems_iospace instances that have not
 > + * been registered.

This is slightly ambiguous. The registration function description claims that it always takes ownership, but this comment suggests that a failed registration attempt may leave an iospace in a state where it will still need to be destroyed.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1243#note_150042
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