RFR: 8298413: [s390] CPUInfoTest fails due to uppercase feature string

[Amit Kumar]

CPUInfoTest.java is failing on s390 due to an incorrect feature string. Feature Vector Enhancement is shown as VEnh2 instead of venh2. Beside that out-of-support date/(tbd) was not being included even if it was present there so this issue is also addressed by this fix.

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Commit messages:
 - fixes CPUInfoTest.java on s390

Changes: https://git.openjdk.org/jdk/pull/12286/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12286&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298413
  Stats: 5 lines in 1 file changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/12286.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12286/head:pull/12286

PR: https://git.openjdk.org/jdk/pull/12286