[Celestica] Ladakh800bcls: Config: Support DVT

[chee-zhang]

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
• pre-commit run

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Summary

To support DVT unit, need to update platform_manager.json and sensor_service.json.

1. platform_manager.json: Fix error reading sensor of PMBUS_3 by setting page 0.
2. sensor_service.json: Update dvt1 related sensor thresholds.

Test Plan

The platform_manager and sensor_service have been tested on following units.

logs_evt1a.zip

logs_evt1b.zip

logs_dvt1.zip