Add build info API to OEMCrypto

Merge from master branch of Widevine repo of http://go/wvgerrit/66065
Merge from oemcrypto-v15 branch of Widevine repo of http://go/wvgerrit/63080

This is for the reference code, the unit tests, and the oemcrypto adapter.

Bug: 116414218
Test: unit tests
Test: tested as part of http://go/ag/5501993

Change-Id: I05a631f6cfcf1584a748b3a0c9ae48633893589f

libwvdrmengine/cdm/core/include/oemcrypto_adapter.h

@@ -56,6 +56,7 @@ OEMCryptoResult OEMCrypto_CreateOldUsageEntry(SecurityLevel level,
     uint8_t* server_mac_key, uint8_t* client_mac_key, const uint8_t* pst,
     size_t pst_length);
 uint32_t OEMCrypto_GetAnalogOutputFlags(SecurityLevel level);
+const char* OEMCrypto_BuildInformation(SecurityLevel level);
 }  // namespace wvcdm
 
 /* The following functions are deprecated in OEMCrypto v13.  They are defined