Enable PSM libs tests for ChromeOS only until rand_r error is fixed.

Bug: chromium:1124018
Change-Id: Ib9e9f3a5bcb93d9dc094e1daee7217c3e01d8922
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2388603
Commit-Queue: Amr Aboelkher <amraboelkher@chromium.org>
Reviewed-by: Amr Aboelkher <amraboelkher@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803642}
GitOrigin-RevId: 6476277eeb5001530056d126ba0717e9a3e8df0f