[lworld] Integrated: 8340190: [lworld] Fix test group after JDK-8328461

[Christian Hagedorn]

[JDK-8328461](https://bugs.openjdk.org/browse/JDK-8328461) renamed the folder `serviceability/jvmti/Valhalla` -> `serviceability/jvmti/valhalla` and forgot to update the corresponding jtreg test group. This lets various tasks fail in our CI.

Thanks,
Christian

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Commit messages:
 - 8340190: [lworld] Fix test group after JDK-8328461

Changes: https://git.openjdk.org/valhalla/pull/1245/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1245&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340190
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/1245.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1245/head:pull/1245

PR: https://git.openjdk.org/valhalla/pull/1245