Pinning fs-verity targets on f2fs during test

The backing block on disk could be relocated by f2fs.  Pinning the file
to avoid corrupting the filesystem.

Test: atest com.android.apkverity.ApkVerityTest
Bug: 112039386
Change-Id: Ieed78d78e948fc38df1c6c654ec55573f9a13543
2 files changed