[Accton][wedge800cact] Remove unused G202X TEMP_5~8 SMB_CPLD sensors

[brandonchuang]

Pre-submission checklist

• I've ran the linters locally and fixed lint errors related to the files I modified in this PR. You can install the linters by running pip install -r requirements-dev.txt && pre-commit install
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Summary:

Remove the four SMB CPLD temperature sensors SMB_U72_G202X_TEMP_5 through SMB_U72_G202X_TEMP_8 from the wedge800cact sensor_service.json.

Motivation:

The SMB reads the MAC-surrounding temperatures from the SMB CPLD (tmp432), exposed as temp<N>_input under /run/devmap/sensors/SMB_CPLD/.

• The previous MAC, G200X, exposed 8 tmp432 temperature channels (temp1_input to temp8_input),
  so the config carried SMB_U72_G202X_TEMP_1 to SMB_U72_G202X_TEMP_8.
• The new MAC, G202X, is introduced starting from DVT and only requires 4 of these channels (temp1_input to temp4_input).

On G202X, temp5_input~temp8_input are not connected to any real device and simply read back 0 (this does not produce a read error). These constant 0 readings are meaningless and misleading in sensor data, so channels 5-8 are removed to keep the config aligned with the G202X hardware.

Changes:

• wedge800cact Netlake-2 sensor_service.json:
  • Remove the sensor definitions for SMB_U72_G202X_TEMP_5, SMB_U72_G202X_TEMP_6, SMB_U72_G202X_TEMP_7, and SMB_U72_G202X_TEMP_8 (mapped to SMB_CPLD/temp5_input-temp8_input).
  • Remove the same four names from the ASIC temperatureSensorNames list so only SMB_U72_G202X_TEMP_1 - SMB_U72_G202X_TEMP_4 remain.

Test plan:

• Validated sensor_service.json is still valid JSON after the removal.
• Confirmed only SMB_U72_G202X_TEMP_1~_4 remain, both in the sensor definitions and in the ASIC temperatureSensorNames list.
• On hardware, sensor_service reads the four remaining SMB CPLD temperatures normally.
  Before the change, temp5_input~temp8_input read a constant 0 (no read error) and only added noise to the sensor data; they are gone after the removal.
  w800c_g202x_sensor_service_log.txt