Merge from Widevine repo of http://go/wvgerrit/61262
This CL helps the CE CDM unit tests provision by providing a helper code to
determine if OEMCrypto is L1 or L3.
Test: unit tests
Test: tested as part of http://go/ag/5501993
Bug: 37286053
Change-Id: Ibe358e0eb628b4051f2db3406eaa6fcfc07f07ff