[jdk21u] RFR: 8316387: Exclude more failing multicast tests on AIX after JDK-8315651

[Christoph Langer]

Backport some AIX specific test exclusions.

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Commit messages:
 - Backport e62419823a06ebd4499c5fadfc1f53a9bc3f71ce

Changes: https://git.openjdk.org/jdk21u/pull/173/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=173&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316387
  Stats: 17 lines in 1 file changed: 12 ins; 4 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u/pull/173.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/173/head:pull/173

PR: https://git.openjdk.org/jdk21u/pull/173