[foreign-memaccess+abi] RFR: Fix visibility issues

[Maurizio Cimadamore]

On Fri, 22 Sep 2023 12:08:00 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes to fix two visibility issues where package private interfaces are exposed via another class' public metods.

Marked as reviewed by mcimadamore (Committer).

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PR Review: https://git.openjdk.org/panama-foreign/pull/891#pullrequestreview-1643915748