mtree: Add missing ossl-modules entry

Reviewed by: imp
Approved by: emaste (mentor)
Fixes: b077aed33b7b ("Merge OpenSSL 3.0.9")
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D48837

(cherry picked from commit 16197cf147e98c2ffc0250f8b71f0fa485c03ecc)