RFR: 8195686: ISO-8859-8-i charset cannot be decoded, should be mapped to ISO-8859-8

[Pratiksha.Sawant]

Mapping ISO-8859-8-I charset to ISO-8859-8.
Below mentioned 2 aliases are added as part of this:-
**ISO-8859-8-I**
**ISO8859-8-I**

The bug report for the same:- https://bugs.openjdk.org/browse/JDK-8195686

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Commit messages:
 - Mapping ISO-8859-8-I charset to ISO-8859-8.

Changes: https://git.openjdk.org/jdk/pull/20690/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20690&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8195686
  Stats: 7 lines in 2 files changed: 4 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/20690.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20690/head:pull/20690

PR: https://git.openjdk.org/jdk/pull/20690