RFR: 8351665: Remove unused UseNUMA in os_aix.cpp

[Joachim Kern]

On Tue, 11 Mar 2025 16:42:27 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> We have some UseNUMA related coding in os_aix.cpp that is not needed.
> UseNUMA is set to false on AIX (with FLAG_SET_ERGO).

If NUMA is maybe provided by AIX in the future we can easily add it again

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Marked as reviewed by jkern (Committer).

PR Review: https://git.openjdk.org/jdk/pull/23991#pullrequestreview-2678028174