Fix fs-verity API for secondary users

While the main fix is on the other change in the topic, this change:
 * Adjust to the installd API change by dropping userId in the call
 * Mark the test as suitable for secondary users

Bug: 319280249
Test: atest FsVerityTest
Test: atest FsVerityTest --user-type secondary_user
Change-Id: I1abc779ddc4fd79644d64b704698d0e7d67a9d75