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/AndroidKeyMintDevice.cpp b/ng/AndroidKeyMintDevice.cpp
index 82e7712..8656c66 100644
--- a/ng/AndroidKeyMintDevice.cpp
+++ b/ng/AndroidKeyMintDevice.cpp
@@ -31,6 +31,7 @@
 namespace aidl::android::hardware::security::keymint {
 
 using namespace ::keymaster;
+using namespace km_utils;
 
 constexpr size_t kOperationTableSize = 16;