[jdk11u-dev] RFR: 8328812: Update and move siphash license

[Andrew Lu]

I backport this for parity with 11.0.24-oracle.

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Commit messages:
 - Backport ce7ebaa606f96fdfee66d300b56022d9903b5ae3

Changes: https://git.openjdk.org/jdk11u-dev/pull/2635/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2635&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/jdk11u-dev/pull/2635.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2635/head:pull/2635

PR: https://git.openjdk.org/jdk11u-dev/pull/2635