RFR: 8346610: Make all imports consistent in the FFM API [v3]

[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 four additional commits since the last revision:

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

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/22827/files
  - new: https://git.openjdk.org/jdk/pull/22827/files/f58f3385..d5e1132a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22827&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22827&range=01-02

  Stats: 515 lines in 24 files changed: 98 ins; 18 del; 399 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