RTEMS | iospace: Add iospace driver (!1243)

[Aaron Nyholm (@eagleirony)]

Aaron Nyholm commented on a discussion on testsuites/libtests/iodev01/init.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1243#note_152720

 > +  /* Test 5 second event */
 > +  event_args.index = 0;
 > +  event_args.timeout.tv_sec = 0;
 > +  event_args.timeout.tv_nsec = 0;
 > +  event_args.args = NULL;
 > +
 > +  clock_gettime( CLOCK_REALTIME, &start_time );
 > +
 > +  status = ioctl( fd, RTEMS_IODEV_IOCTL_EVENT_WAIT, &event_args );
 > +
 > +  clock_gettime( CLOCK_REALTIME, &end_time );
 > +  _Timespec_Subtract( &start_time, &end_time, &duration );
 > +  rtems_test_assert( !status );
 > +  rtems_test_assert( event_args.timedout == false );
 > +  rtems_test_assert( duration.tv_sec >= 4 );
 > +  rtems_test_assert( duration.tv_sec <= 5 );

Moved into a function.

The test is setup that for event 0 an event occurs 5 seconds after a wait ioctl. This is testing that events cause the return and not the timeout. I've added a define from the `test_iodev` for this time to make the connection clearer.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1243#note_152720
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