Merge OEMCrypto KDF and usage functions

Since KDF functions are only used right before specific functions, this
merges them to simplify internal state within OEMCrypto.

Fixes: 299527712
Change-Id: I426cfcdc102bd73cf65cd809b213da2474f44b34

libwvdrmengine/oemcrypto/test/oemcrypto_license_test.cpp

@@ -472,9 +472,12 @@ TEST_P(OEMCryptoLicenseTest, LoadKeyUnalignedMessageAPI16) {
                 license_messages_.encrypted_response_buffer().end());
   // Thus, buffer[offset] is NOT word aligned.
   const uint8_t* unaligned_message = &buffer[offset];
+  const std::vector<uint8_t> context = session_.GetDefaultContext();
   ASSERT_EQ(OEMCrypto_SUCCESS,
             OEMCrypto_LoadLicense(
-                session_.session_id(), unaligned_message,
+                session_.session_id(), context.data(), context.size(),
+                session_.enc_session_key().data(),
+                session_.enc_session_key().size(), unaligned_message,
                 license_messages_.encrypted_response_buffer().size(),
                 license_messages_.serialized_core_message().size(),
                 license_messages_.response_signature().data(),