remove unused device data function

Signed-off-by: Yuanzhe, Liu <[email protected]>

Author: yuazhe

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

@@ -247,11 +247,6 @@ def get_fan_count(cls):
     def is_fan_hotswapable(cls):
         return utils.read_int_from_file('/run/hw-management/config/hotplug_fans') > 0
 
-    @classmethod
-    @utils.read_only_cache()
-    def get_leakage_sensor_count(cls):
-        return len(glob.glob('/var/run/hw-management/system/leakage*'))
-
     @classmethod
     @utils.read_only_cache()
     def get_psu_count(cls):