Bulk fetch metrics from rocm_smi_lib

The RDC provides a wrapper to bulk fetch metrics from rocm_smi_lib.

If the video card does not support bulk fetch or the metrics cannot be
bulk fetched, it will fallback to fetch them one by one.

Change-Id: I8852ba1ed67e0fabc805c93b1080f74c233516e1

include/rdc_lib/impl/RdcMetricFetcherImpl.h

@@ -70,6 +70,9 @@ class RdcMetricFetcherImpl: public RdcMetricFetcher {
  public:
     rdc_status_t fetch_smi_field(uint32_t gpu_index,
         rdc_field_t field_id, rdc_field_value* value) override;
+    rdc_status_t bulk_fetch_smi_fields(
+        rdc_gpu_field_t* fields, uint32_t fields_count,
+        std::vector<rdc_gpu_field_value_t>& results) override;  // NOLINT
     RdcMetricFetcherImpl();
     ~RdcMetricFetcherImpl();