RFR: 8346610: Make all imports consistent in the FFM API [v2]

[Per Minborg]

> This PR proposes to clean up all the imports in the FFM lib (excluding tests).
> 
> Passes tier1-tier3

Per Minborg has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Update copyright year and reformat
 - Merge branch 'master' into fix-imports
 - Fix imports

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22827/files
  - new: https://git.openjdk.org/jdk/pull/22827/files/490701e9..f58f3385

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22827&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22827&range=00-01

  Stats: 21305 lines in 430 files changed: 8799 ins; 10905 del; 1601 mod
  Patch: https://git.openjdk.org/jdk/pull/22827.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22827/head:pull/22827

PR: https://git.openjdk.org/jdk/pull/22827