kfdtest: Add missing default switch label in GetQueue function

There is no default case, and we were missing a few types defined from
hsakmttypes.h. This was found via clang

Change-Id: I26193cb111a9d8220b1eff21c7313fe060288f36


[ROCm/ROCR-Runtime commit: 761d9d84d2]

projects/rocr-runtime/tests/kfdtest/src/BaseQueue.cpp

@@ -186,6 +186,8 @@ BaseQueue* QueueArray::GetQueue(unsigned int Node) {
     case HSA_QUEUE_COMPUTE_AQL:
         pQueue = new AqlQueue();
         break;
+    default:
+        return NULL;
     }
 
     if (pQueue) {