RFR: 8369349: Add missing CPE headers

[Sorna Sarathi N]

Adds missing classpath exception copyright headers.

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Commit messages:
 - Adds missing CPE headers

Changes: https://git.openjdk.org/jdk/pull/27687/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27687&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8369349
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/27687.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27687/head:pull/27687

PR: https://git.openjdk.org/jdk/pull/27687