amdsmi_cli: Add checks for no gpu devices, cpu and core devices

- Add checks for no gpu devices, cpu and core devices
  - Update units for core energy and cpu energy

Change-Id: Ieea43f1bb7fc303ebbbdf72f1ab22644a28df25c

py-interface/amdsmi_interface.py

@@ -743,7 +743,7 @@ def amdsmi_get_cpu_core_energy(
         )
     )
 
-    return f"{penergy.value} J"
+    return f"{float(penergy.value * pow(10, -6))} J"
 
 def amdsmi_get_cpu_socket_energy(
     processor_handle: amdsmi_wrapper.amdsmi_processor_handle
@@ -760,7 +760,7 @@ def amdsmi_get_cpu_socket_energy(
         )
     )
 
-    return f"{penergy.value} J"
+    return f"{float(penergy.value * pow(10, -6))} J"
 
 def amdsmi_get_cpu_prochot_status(
     processor_handle: amdsmi_wrapper.amdsmi_processor_handle