Merge of http://go/wvgerrit/45521/
Bug: b/73818548
Test: request_license_tests and GTS tests on sailfish and taimen
This change loads the mac keys into the session to be used in
GenerateSignature from the last call to one of: DeriveKeysFromSessionKey,
GenerateDerivedKeys, LoadKeys, and LoadUsageEntry. OEMCrypto tests are
changed to reflect this as well (specifically the order in which we call
the above methods).