RFR: 8345073: Remove SecurityManager checks from sun.awt.image classes

[Phil Race]

Remove SecurityManager related code from sun.awt.image classes

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Commit messages:
 - 8345073

Changes: https://git.openjdk.org/jdk/pull/22398/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22398&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345073
  Stats: 192 lines in 8 files changed: 1 ins; 174 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/22398.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22398/head:pull/22398

PR: https://git.openjdk.org/jdk/pull/22398