Update LoadTestKeybox

Merge from Widevine repo of http://go/wvgerrit/41662

This CL updates oemcrypto unit tests to use the new test keybox.

bug: 69552641 Update OEMCrypto_LoadTestKeybox

test: Unit tests compile and run -- many tests won't pass until merged
with vendor code

Change-Id: I73bdca3958b2c985d4c61801aa95807a2e6d4299

libwvdrmengine/oemcrypto/test/oemcrypto_session_tests_helper.h

@@ -34,6 +34,7 @@ public:
 
   std::vector<uint8_t> encoded_rsa_key_;
   std::vector<uint8_t> wrapped_rsa_key_;
+  wvoec_mock::WidevineKeybox keybox_;
 };
 
 }  // namespace wvoec