[SWDEV-489696] Improve AMD SMI Python APIs Functional and Unit Testing (#468)

* Adding python unit tests
* Remove duplicate functions definitions
* Added missing classes for __init__ for py-interface

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Signed-off-by: josnarlo <Joseph.Narlo@amd.com>
Signed-off-by: Maisam Arif <Maisam.Arif@amd.com>

py-interface/__init__.py

@@ -259,6 +259,9 @@ from .amdsmi_interface import AmdSmiDeviceType
 from .amdsmi_interface import AmdSmiMmIp
 from .amdsmi_interface import AmdSmiFwBlock
 from .amdsmi_interface import AmdSmiClkType
+from .amdsmi_interface import AmdSmiClkLimitType
+
+from .amdsmi_interface import AmdSmiRegType
 from .amdsmi_interface import AmdSmiTemperatureType
 from .amdsmi_interface import AmdSmiDevPerfLevel
 from .amdsmi_interface import AmdSmiEventGroup