Do not require fs-verity built-in signature

There are use cases where fs-verity without signature is helpful. Relax
the restriction. Existing use cases (other than work-in-progress
features) of fs-verity in AOSP has been migrated to signature check in
userspace.

Bug: 249158715
Test: CtsAppSecurityHostTestCases:android.appsecurity.cts.ApkVerityInstallTest
Ignore-AOSP-First: Security implication requires some change in frameworks/base
Change-Id: I6b7d7143485ad304d4aa7e8a924d32d558540b92
Merged-In: I6b7d7143485ad304d4aa7e8a924d32d558540b92
1 file changed