Change KeyParameters to use a union.

This CL updates AndroidKeyMintDevice to use the new unionized
KeyParameters.

Test: VtsAidlKeyMintTargetTest
Change-Id: I2be1a192d26d44c99a33a8daf41937264ba5ab63
diff --git a/ng/AndroidKeyMintOperation.cpp b/ng/AndroidKeyMintOperation.cpp
index bfbce20..5f29b11 100644
--- a/ng/AndroidKeyMintOperation.cpp
+++ b/ng/AndroidKeyMintOperation.cpp
@@ -33,6 +33,7 @@
 using ::keymaster::FinishOperationResponse;
 using ::keymaster::UpdateOperationRequest;
 using ::keymaster::UpdateOperationResponse;
+using namespace km_utils;
 
 AndroidKeyMintOperation::AndroidKeyMintOperation(
     const shared_ptr<::keymaster::AndroidKeymaster> implementation,