RTEMS | Add timespec_get() support to RTEMS (!670)

[mazen Adel (@mez3n)]

mazen Adel commented on a discussion on testsuites/psxtests/psxtimes01/init.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/670#note_129312

 >    rtems_test_assert( end_tm.tms_cstime == 0 );
 > +}
 > +
 > +static void test_timespec_functions( void )
 > +{
 > +  struct timespec start_ts;
 > +  struct timespec end_ts;
 > +  struct timespec clock_ts;
 > +  int             result;
 > +  int             interval = 5;
 > +
 > +  puts( "\n*** Testing timespec_get() functions ***" );
 > +
 > +  puts( "timespec_get( NULL, TIME_UTC ) -- EINVAL" );
 > +  result = timespec_get( NULL, TIME_UTC );
 > +  rtems_test_assert( result == 0 );

Nothing about the errors was written in either [Posix Issue 8 docs ](https://pubs.opengroup.org/onlinepubs/9799919799/functions/timespec_get.html)or [C11 docs](https://en.cppreference.com/w/c/chrono/timespec_get), [Linux](https://man7.org/linux/man-pages/man3/timespec_get.3.html) however said not to depend on a return value. So we can either set `errno = EINVAL` or not which depends on your opinion. If not I should change the comment because it is misleading.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/670#note_129312
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