RTEMS | libtests/ttest01: Fix CPU counter precision issues (!311)

[Kinsey Moore (@opticron)]

Kinsey Moore commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/311#note_120743


This appears to have caused a constant failure on AArch64 hardware (ZynqMP) while still passing on the QEMU BSP:
```
P:2:0:UI1:test-time.c:152
FAILED:80:*ctx->c == c
```

The failing comparison generates a string representation `1.099999992` instead of the expected `1.100000000`.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/311#note_120743
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