Fix empty cpu agent on raven system

Change-Id: I30f5e65367613152ce96b80b13e1c9f2a28da807

rocclr/device/rocm/rocmemory.cpp

@@ -867,7 +867,9 @@ bool Buffer::create() {
   if (owner()->getSvmPtr() != owner()->getHostMem()) {
     if (memFlags & (CL_MEM_USE_HOST_PTR | CL_MEM_ALLOC_HOST_PTR)) {
       hsa_amd_memory_pool_t pool = (memFlags & CL_MEM_SVM_ATOMICS) ?
-                                    dev().SystemSegment() : dev().SystemCoarseSegment();
+                                    dev().SystemSegment() :
+                                    (dev().SystemCoarseSegment().handle != 0 ?
+                                        dev().SystemCoarseSegment() : dev().SystemSegment());
       hsa_status_t status = hsa_amd_memory_lock_to_pool(owner()->getHostMem(),
           owner()->getSize(), nullptr, 0, pool, 0, &deviceMemory_);
       if (status != HSA_STATUS_SUCCESS) {