RFR: 8345286: Remove use of SecurityManager API from misc areas

[Jaikiran Pai]

Can I please get a review of this change which removes usages of SecurityManager related APIs and some leftover related to SecurityManager changes?

This addresses https://bugs.openjdk.org/browse/JDK-8345286. Most of these changes are trivial. The `src/java.base/linux/classes/jdk/internal/platform/CgroupUtil.java` used to expose utility methods for dealing with SecurityManager permissions and it was called from a few places. That class is no longer needed with the clean up done in this PR.

No new tests have been introduced and tier testing is currently in progress.

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Commit messages:
 - update VectorIntrinsics too
 - 8345286: Remove use of SecurityManager API from misc areas

Changes: https://git.openjdk.org/jdk/pull/22478/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22478&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345286
  Stats: 432 lines in 26 files changed: 53 ins; 320 del; 59 mod
  Patch: https://git.openjdk.org/jdk/pull/22478.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22478/head:pull/22478

PR: https://git.openjdk.org/jdk/pull/22478