RTEMS | tc-timecounter-install.c:356:37: warning: left shift of negative value (#5385)

[Joel Sherrill (@joel)]

Joel Sherrill created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5385

Assignees: Gedare Bloom and Sebastian Huber

## Summary

In the primary configuration I am testing, this is the last left shift of negative value warning.

```
../../../testsuites/validation/tc-timecounter-install.c: In function 'NtpUpdateAdjustmentSlower':
../../../testsuites/validation/tc-timecounter-install.c:356:37: warning: left shift of negative value [-Wshift-negative-value]
  356 |   *adjustment = -( (int64_t) 5000 ) << 32;
      |                                     ^~
```

Assigning to @gedare and @sebhub in case it requires touching rtems-central.

## Steps to reproduce

Build with this warning enabled and w/o -Werror.

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