aidl: Improve Effect VTS naming

Use uuid in hexadecimal format in testcase name.

Change-Id: Ib687b6617060e4400a767f23ca0b26cece4005f1
diff --git a/audio/aidl/vts/VtsHalAudioEffectFactoryTargetTest.cpp b/audio/aidl/vts/VtsHalAudioEffectFactoryTargetTest.cpp
index 9cd6c22..8084a59 100644
--- a/audio/aidl/vts/VtsHalAudioEffectFactoryTargetTest.cpp
+++ b/audio/aidl/vts/VtsHalAudioEffectFactoryTargetTest.cpp
@@ -36,6 +36,11 @@
 #include "EffectFactoryHelper.h"
 #include "TestUtils.h"
 
+#include <system/audio_aidl_utils.h>
+
+using namespace android;
+using ::android::audio::utils::toString;
+
 using namespace android;
 
 using aidl::android::hardware::audio::effect::Descriptor;
@@ -93,7 +98,7 @@
             std::shared_ptr<IEffect> effect;
             EXPECT_STATUS(expectStatus, mEffectFactory->createEffect(uuid, &effect));
             if (expectStatus == EX_NONE) {
-                EXPECT_NE(effect, nullptr) << " null effect with uuid: " << uuid.toString();
+                EXPECT_NE(effect, nullptr) << " null effect with uuid: " << toString(uuid);
                 effects.push_back(std::move(effect));
             }
         }
@@ -148,7 +153,7 @@
     }
     std::string msg = " missing type UUID:\n";
     for (const auto& uuid : typeUuidSet) {
-        msg += (uuid.toString() + "\n");
+        msg += (toString(uuid) + "\n");
     }
     SCOPED_TRACE(msg);
     EXPECT_EQ(0UL, typeUuidSet.size());