RFR: JDK-8323331: fix typo hpage_pdm_size

[Matthias Baesken]

In https://bugs.openjdk.org/browse/JDK-8322098, Praveen Mohan pointed out that there is a typo in os_linux regarding the hpage related output. That should be fixed.

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Commit messages:
 - JDK-8323331

Changes: https://git.openjdk.org/jdk/pull/17339/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17339&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8323331
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17339.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17339/head:pull/17339

PR: https://git.openjdk.org/jdk/pull/17339