RFR: 8324512: Serial: Remove Generation::Name

[Albert Mingkun Yang]

Trivial removing redundant code.

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Commit messages:
 - s1-enum

Changes: https://git.openjdk.org/jdk/pull/17530/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17530&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324512
  Stats: 66 lines in 9 files changed: 0 ins; 64 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/17530.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17530/head:pull/17530

PR: https://git.openjdk.org/jdk/pull/17530