fix: [rocm/amd_smi_lib] amdsmi_get_gpu_activity gfx/memory activity does not update

Checks and forces rereading gpu metrics unconditionally

Code changes related to the following:
  * Device::dev_log_gpu_metrics()
  * amdsmi_get_gpu_metrics_header_info()
    Removed unintentionally during work on 'header cleanup Remove non-unified headers'
  * Examples
  * Unit tests

Change-Id: I83710e173c0f7102d0b7f865c18474c979a95cd8
Signed-off-by: Oliveira, Daniel <daniel.oliveira@amd.com>

src/amd_smi/amd_smi.cc

@@ -1108,6 +1108,17 @@ amdsmi_status_t  amdsmi_get_gpu_ecc_status(amdsmi_processor_handle processor_han
                     reinterpret_cast<rsmi_ras_err_state_t*>(state));
 }
 
+amdsmi_status_t
+amdsmi_get_gpu_metrics_header_info(amdsmi_processor_handle processor_handle,
+                amd_metrics_table_header_t *header_value)
+{
+    AMDSMI_CHECK_INIT();
+    // nullptr api supported
+
+    return rsmi_wrapper(rsmi_dev_metrics_header_info_get, processor_handle,
+                    reinterpret_cast<metrics_table_header_t*>(header_value));
+}
+
 amdsmi_status_t  amdsmi_get_gpu_metrics_info(
         amdsmi_processor_handle processor_handle,
         amdsmi_gpu_metrics_t *pgpu_metrics) {