Allow previously signed fs-verity files.

AddFilesToVerityRecursive() would fail if any of the files considered
was already in fs-verity. This is not desirable in case of partial
compilation, where some files might already have been generated and
signed on a previous boot. Allow such files, because earlier code will
already have verified that their signature matched the signature that we
remember anyway.

Bug: 205276874
Test: atest odsign_e2e_tests
Change-Id: Iaf35607d0054bdcd00501c6102ad629ce9fe7ac3
2 files changed