This makes Package Manager require APK Signature Scheme v2 signatures
for ephemeral APKs. This part of the effort to deprecate the v1
signature scheme based on JAR signing.
Test: cts-tradefed run singleCommand cts --skip-device-info --skip-preconditions --skip-connectivity-check --abi arm64-v8a --module CtsAppSecurityHostTestCases -t android.appsecurity.cts.PkgInstallSignatureVerificationTest
Bug: 33700225
Change-Id: I3b408487c07085c0a7924d3eca495bdcb344b32d
abbc2badf5