[mellaonox]: No need enable thermal zones in thermal_manager.deinitialize since they are enabled by default (#7556)

No need enable thermal zones in thermal_manager.deinitialize since they are enabled by default. And removing this will faster thermalctld exit speed

Author: Junchao-Mellanox

platform/mellanox/mlnx-platform-api/sonic_platform/thermal_manager.py

@@ -16,15 +16,6 @@ def initialize(cls):
         """
         cls._add_private_thermal_policy()
 
-    @classmethod
-    def deinitialize(cls):
-        """
-        Destroy thermal manager, including any vendor specific cleanup. The default behavior of this function
-        is a no-op.
-        :return:
-        """
-        cls.start_thermal_control_algorithm()
-
     @classmethod
     def start_thermal_control_algorithm(cls):
         """