RTEMS | iospace: Add iospace driver (!1243)

[Aaron Nyholm (@eagleirony)]

Aaron Nyholm commented on a discussion on cpukit/include/dev/iospace/iospace.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1243#note_151527

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

I've revisited this and moved `rtems_iodev_destroy` and `rtems_iodev_free_and_destroy` to a single call, `rtems_iodev_destroy_unregistered`. Additionally, a failed register does not destroy the `iodev`. This makes the API much clearer as the implied symmetricality of the API is removed.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1243#note_151527
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