RFR: 8350820: The OperatingSystemMXBean cpuLoad() methods return -1.0 in Windows

[Leonid Mesnik]

The problem was introduced by the 
https://bugs.openjdk.org/browse/JDK-8336289

This pr just revert changes in src/jdk.management/windows/native/libmanagement_ext/OperatingSystemImpl.c

The test fix is going to be pushed separately (for easy backporting) bug https://bugs.openjdk.org/browse/JDK-8350818

I verified that updated tests failed (bean returns -1.0) and now passed, also run tier1-5 testing.

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Commit messages:
 - 8350820

Changes: https://git.openjdk.org/jdk/pull/23832/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23832&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8350820
  Stats: 30 lines in 1 file changed: 0 ins; 0 del; 30 mod
  Patch: https://git.openjdk.org/jdk/pull/23832.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23832/head:pull/23832

PR: https://git.openjdk.org/jdk/pull/23832