Retrieve cache line size from KFD topology.

Change-Id: I16ddd9d9888bb973eccf3c562619894c88c7df15


[ROCm/ROCR-Runtime commit: 21291b48c6]

projects/rocr-runtime/runtime/hsa-runtime/core/runtime/amd_gpu_agent.cpp

@@ -924,9 +924,12 @@ hsa_status_t GpuAgent::GetInfo(hsa_agent_info_t attribute, void* value) const {
       *((uint32_t*)value) = properties_.DeviceId;
       break;
     case HSA_AMD_AGENT_INFO_CACHELINE_SIZE:
-      // TODO: hardcode for now.
-      // GCN whitepaper: cache line size is 64 byte long.
-      *((uint32_t*)value) = 64;
+      for (auto& cache : cache_props_) {
+        if (cache.CacheLineSize != 0) {
+          *((uint32_t*)value) = cache.CacheLineSize;
+          break;
+        }
+      }
       break;
     case HSA_AMD_AGENT_INFO_COMPUTE_UNIT_COUNT:
       *((uint32_t*)value) =