Default HostMalloc to uncached memory

Change-Id: I72e19c7f7820a77fd5afc09f09cfea9acd0b8e84

hipamd/vdi/hip_memory.cpp

@@ -209,7 +209,8 @@ hipError_t hipHostMalloc(void** ptr, size_t sizeBytes, unsigned int flags) {
   }
 
   unsigned int ihipFlags = CL_MEM_SVM_FINE_GRAIN_BUFFER | (flags << 16);
-  if (flags & (hipHostMallocCoherent | hipHostMallocMapped) ||
+  if (flags == 0 ||
+      flags & (hipHostMallocCoherent | hipHostMallocMapped) ||
      (!(flags & hipHostMallocNonCoherent) && HIP_HOST_COHERENT)) {
     ihipFlags |= CL_MEM_SVM_ATOMICS;
   }