RFR: 8367486: Change prefix for platform-dependent AtomicAccess files

[Stefan Karlsson]

JDK-8367014 renamed the class Atomic to AtomicAccess and renamed atomic.hpp to atomicAccess.hpp. I propose that we also rename the platform-dependent headers that implement the AtomicAccess support to be named atomicAccess_<os>_<arch>.hpp.

Note that I left atomic_aarch64.hpp and atomic_linux_aarch64.S intact since they clear, external usages outside of the AtomicAccess class.

I will verify that this still builds on the platform that I can easily build.

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Commit messages:
 - 8367014: Change prefix for platform-dependent AtomicAccess files

Changes: https://git.openjdk.org/jdk/pull/27245/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27245&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367486
  Stats: 52 lines in 14 files changed: 0 ins; 1 del; 51 mod
  Patch: https://git.openjdk.org/jdk/pull/27245.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27245/head:pull/27245

PR: https://git.openjdk.org/jdk/pull/27245