RTEMS | counder_yu64 is broken on SMP archs (#5793)

[Chris Johns (@chris)]

Issue created by Chris Johns: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5793

Assignee: Sebastian Huber

## Summary

Running `netstat -i` on an SMP LibBSD build of RTEMS just after booting results in:

```
xcon [/] # netstat -i
Name    Mtu Network        Address               Ipkts  Ierrs  Idrop     Opkts  Oerrs   Coll
cgem0  1500 <Link#1>       72:44:fa:b0:29:da    153687      0      0     86831      0      0
cgem0     - 10.10.5.0/24   10.10.5.70            86733      -      -     48516      -      -
lo0   16384 <Link#2>       lo0                     128      0      0  26324640 13999735  26384
lo0       - ::1/128        ::1                      64      -      -        64      -      -
lo0       - fe80::%lo0/64  fe80::1%lo0               0      -      -         0      -      -
lo0       - 127.0.0.0/8    127.0.0.1                48      -      -        48      -      -
```

It looks like something is not aligned correctly. These calls are used by LibBSD in `if.c` to manage the 64bit counters in a safe way on SMP.

## Steps to reproduce

Run `netstat -i` on a Zynq or ZynqMP SMP system. Verified on Zynq and ZynqMP hardware.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5793
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