RFR: JDK-8349780 : AIX os::get_summary_cpu_info support Power 11

[Suchismith Roy]

AIX os::get_summary_cpu_info function still misses support for Power 11, this should be changed.

JBS-Issue: [JDK-8349780](https://bugs.openjdk.org/browse/JDK-8349780l)

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Commit messages:
 - Support for power 11
 - Support for power 11
 - Support for power 11
 - Support for power 11
 - Support for power 11

Changes: https://git.openjdk.org/jdk/pull/23556/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23556&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8349780
  Stats: 12 lines in 1 file changed: 12 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/23556.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23556/head:pull/23556

PR: https://git.openjdk.org/jdk/pull/23556