[jdk22u] RFR: 8326446: The User and System of jdk.CPULoad on Apple M1 are inaccurate

[Long Yang]

Hi all

Could I have a review of this backport.

This pull request contains a backport of commit [8dbd4b391f7deb1a46a5f07f0bc46f23d6715ddb](https://github.com/openjdk/jdk/commit/8dbd4b391f7deb1a46a5f07f0bc46f23d6715ddb) from the [openjdk/jdk](https://github.com/openjdk/jdk) repository.

This backport is clean.

Testing: I ran test/jdk/jdk/jfr/event/os/TestCPULoad.java and passed.

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Commit messages:
 - 8326446: The User and System of jdk.CPULoad on Apple M1 are inaccurate

Changes: https://git.openjdk.org/jdk22u/pull/161/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk22u&pr=161&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326446
  Stats: 30 lines in 1 file changed: 1 ins; 8 del; 21 mod
  Patch: https://git.openjdk.org/jdk22u/pull/161.diff
  Fetch: git fetch https://git.openjdk.org/jdk22u.git pull/161/head:pull/161

PR: https://git.openjdk.org/jdk22u/pull/161