[jdk21u-dev] RFR: 8328812: Update and move siphash license

[Andrew Lu]

I backport this for parity with 21.0.3-oracle.

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Commit messages:
 - Backport ce7ebaa606f96fdfee66d300b56022d9903b5ae3

Changes: https://git.openjdk.org/jdk21u-dev/pull/424/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=424&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328812
  Stats: 4 lines in 1 file changed: 1 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/424.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/424/head:pull/424

PR: https://git.openjdk.org/jdk21u-dev/pull/424