RTEMS | iospace: Add iospace driver (!1243)

[Kinsey Moore (@opticron)]

Kinsey Moore commented on a discussion on cpukit/include/dev/iospace/iospace.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1243#note_150182

 > +
 > +/**
 > + * @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.

Actually, I would say it's useful when you're trying to allocate several things at once and if something else fails along the way you'd still need this function if you never attempted the registration.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1243#note_150182
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