RFR: 8324771: Obsolete RAMFraction related flags

[Albert Mingkun Yang]

Simple obsoleting four related deprecated jvm flags.

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Commit messages:
 - obsolete

Changes: https://git.openjdk.org/jdk/pull/17592/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17592&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324771
  Stats: 50 lines in 6 files changed: 4 ins; 45 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17592.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17592/head:pull/17592

PR: https://git.openjdk.org/jdk/pull/17592