[Mellanox] Ensure concrete platform API classes call base class initializer (#6854)

In preparation for the merging of Azure/sonic-platform-common#173, which properly defines class and instance members in the Platform API base classes.

It is proper object-oriented methodology to call the base class initializer, even if it is only the default initializer. This also future-proofs the potential addition of custom initializers in the base classes down the road.

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

@@ -323,6 +323,7 @@ class ONIEUpdater(object):
 
 class Component(ComponentBase):
     def __init__(self):
+        super(Component, self).__init__()
         self.name = None
         self.description = None
         self.image_ext_name = None

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

@@ -393,6 +393,7 @@ class Thermal(ThermalBase):
         """
         index should be a string for category ambient and int for other categories
         """
+        super(Thermal, self).__init__()
         if category == THERMAL_DEV_CATEGORY_AMBIENT:
             self.name = thermal_ambient_name[index]
             self.index = index

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

@@ -63,6 +63,7 @@ class WatchdogImplBase(WatchdogBase):
         Open a watchdog handle
         @param wd_device_path Path to watchdog device
         """
+        super(WatchdogImplBase, self).__init__()
 
         self.watchdog_path = wd_device_path
         self.watchdog = os.open(self.watchdog_path, os.O_WRONLY)