[foreign-jextract] RFR: reduce specific exports from jdk.incubator.foreign to jdk.incubator.jextract

[Athijegannathan Sundararajan]

reduce specific exports from jdk.incubator.foreign to jdk.incubator.jextract

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Commit messages:
 - reduce specific exports from jdk.incubator.foreign to jdk.incubator.jextract.

Changes: https://git.openjdk.java.net/panama-foreign/pull/240/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/240/webrev.00
  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/240.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/240/head:pull/240

PR: https://git.openjdk.java.net/panama-foreign/pull/240