RFR: 8303362: Serial: Move CardTableRS to serial directory

Tue Feb 28 15:47:15 UTC 2023

Simple refactoring to move a Serial-only file outside `shared` folder. Split into two commits for easier reviewing.

1. Move and renaming.
2. Sort headers.

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Commit messages:
 - sort
 - move-cardtablers

Changes: https://git.openjdk.org/jdk/pull/12789/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12789&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303362
  Stats: 20 lines in 12 files changed: 6 ins; 7 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/12789.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12789/head:pull/12789

PR: https://git.openjdk.org/jdk/pull/12789