Merge of http://go/wvgerrit/68986
Bug: b/120797208
Test: Android + Linux unit tests
OEMCrypto v15.1 introduced changes to full decrypt path testing.
This CL reflects those changes for the Level 3 code, including
removing InitializeDecryptHash and changes to error reporting.
Change-Id: I09cec6743524d326cb1a6c3ba4dd1764dbefff5f