RFR: 8346602: Remove unused macro parameters in `jni.cpp`

[Qizheng Xing]

Some of the macros in `jni.cpp`, including `DEFINE_GETSCALARARRAYELEMENTS`, `DEFINE_RELEASESCALARARRAYELEMENTS`, `DEFINE_GETSCALARARRAYREGION` and `DEFINE_SETSCALARARRAYREGION`, have unused parameters.

This patch removes them.

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Commit messages:
 - Remove unused macro parameters in `jni.cpp`.

Changes: https://git.openjdk.org/jdk/pull/22824/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22824&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346602
  Stats: 39 lines in 1 file changed: 0 ins; 0 del; 39 mod
  Patch: https://git.openjdk.org/jdk/pull/22824.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22824/head:pull/22824

PR: https://git.openjdk.org/jdk/pull/22824