RFR: 8269687: pauth_aarch64.hpp include name is incorrect

[Alan Hayward]

Quick fix to correct the include guards.

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Commit messages:
 - 8269687: pauth_aarch64.hpp include name is incorrect

Changes: https://git.openjdk.java.net/jdk/pull/5196/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5196&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269687
  Stats: 9 lines in 3 files changed: 0 ins; 0 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5196.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5196/head:pull/5196

PR: https://git.openjdk.java.net/jdk/pull/5196