RFR: 8308246: PPC64le build broken after JDK-8304913

[Martin Doerr]

PPC64le needs to get recognized as PPC64. Otherwise, jlink doesn't recognize the platform and throws a PluginException: ModuleTarget is malformed: No enum constant jdk.internal.util.Architecture.PPC64LE.

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Commit messages:
 - 8308246: PPC64le build broken after JDK-8304913

Changes: https://git.openjdk.org/jdk/pull/14027/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14027&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308246
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/14027.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14027/head:pull/14027

PR: https://git.openjdk.org/jdk/pull/14027