Add support for reading GPU's unique ID

Add support and testing for reading the Unique ID associated with a
specific GPU. This ID will persist across reboots, even if the GPU is
moved to a different machine. Note that this is per-GPU, not per-card,
as some cards have multiple GPUs, and each GPU will get a unique
identifier

Change-Id: Idce50c6febc2ceb1a4c1200d2489ec8b9d8fe174

src/rocm_smi.cc

@@ -2107,3 +2107,14 @@ rsmi_dev_pci_replay_counter_get(uint32_t dv_ind, uint64_t *counter) {
   CATCH
 }
 
+rsmi_status_t
+rsmi_dev_unique_id_get(uint32_t dv_ind, uint64_t *unique_id) {
+  TRY
+  DEVICE_MUTEX
+  rsmi_status_t ret;
+
+  ret = get_dev_value_int(amd::smi::kDevUniqueId, dv_ind, unique_id);
+  return ret;
+
+  CATCH
+}