hw-mgmt: thermal: Correct DPU voltmon sensor attribute

TC was expecting the voltmon temperature sensor attribute
from dpu as dpu_voltmon[1-2]_temp1_input. This commit
removes the 'dpu' prefix.

Signed-off-by: Ciju Rajan K <crajank@nvidia.com>

usr/usr/bin/hw_management_thermal_control.py

@@ -3154,7 +3154,7 @@ def add_DPU_voltmon_sensor(self, name):
             dpu_idx = res.group(1)
             voltmon_name = res.group(2)
             sensor_name = "{}_temp".format(name)
-            in_file = "{}/thermal/dpu_{}_temp1".format(dpu_idx, voltmon_name)
+            in_file = "{}/thermal/{}_temp1".format(dpu_idx, voltmon_name)
             self._sensor_add_config("thermal_sensor", sensor_name, {"base_file_name": in_file})
 
     # ----------------------------------------------------------------------