Fix [Not supported] status for get_compute_process_info_by_pid

On some systems [rocm-smi --showpids] reports
get_compute_process_info_by_pid, Not supported on the given system
[PID] [PROCESS NAME] 1 UNKNOWN UNKNOWN UNKNOWN

get_compute_process_info_by_pid fails because cu_occupancy debugfs method
is not provided on some graphics cards and GFX revisions by design

Proposing a change to return success status when only cu_occupancy debugfs method
is not found and provide cu_occupancy invalidation value to mark only
this parameter as UNKNOWN

Change-Id: Iae37070d9bd19483b4e6c8ee24c7d9a4c92f00d7
Signed-off-by: Vladimir Stempen <Vladimir.Stempen@amd.com>
Reviewed-by: Galantsev, Dmitrii <dmitrii.galantsev@amd.com>

src/rocm_smi_kfd.cc

@@ -507,7 +507,9 @@ int GetProcessInfoForPID(uint32_t pid, rsmi_process_info_t *proc,
       // Collect count of compute units
       cu_count += kfd_node_map[gpu_id]->cu_count();
     } else {
-      return err;
+      //Some GFX revisions do not provide cu_occupancy debugfs method 
+      proc->cu_occupancy = CU_OCCUPANCY_INVALID;
+      cu_count = 0;
     }
   }