RFR: 8351851: Update PmemTest to run on AMD64 [v2]

[Ivan Šipka]

> Remove default OS platform linux x86_64, remove @ignores allowing amd64 as a viable OS platform selection

Ivan Šipka has updated the pull request incrementally with two additional commits since the last revision:

 - removing accidentally added files, reverting to two test cases bu removing @ignores directive and adding test ids
 - copyright update

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24416/files
  - new: https://git.openjdk.org/jdk/pull/24416/files/f6822b82..eae29977

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24416&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24416&range=00-01

  Stats: 10 lines in 1 file changed: 1 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/24416.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24416/head:pull/24416

PR: https://git.openjdk.org/jdk/pull/24416