RFR: 8371746: Some imports in Integer.java and Long.java became unused after JDK-8370503

[Sergey Bylokhov]

Trivial patch. Removes unused imports from `Integer.java` and `Long.java` following [JDK-8370503](https://bugs.openjdk.org/browse/JDK-8370503).

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Commit messages:
 - 8371746: Some imports in Integer.java and Long.java became unused after JDK-8370503

Changes: https://git.openjdk.org/jdk/pull/28277/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28277&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8371746
  Stats: 4 lines in 2 files changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28277.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28277/head:pull/28277

PR: https://git.openjdk.org/jdk/pull/28277