[Celestica] Icecube: Config: Migrate icecube fan CPLD to fbfancpld and inline hardware configs

[zhongedward]

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

Summary

Migrate the icecube fan CPLD kernel device definition from the legacy icecube_fancpld down to the unified upstream standard fbfancpld driver.

Mainly change as follows:

• Set active fan count payload (numFans: 4).
• Set the absolute raw hardware register limitation (pwmMax: 64).
• Align the tachometer pulse factor mapping via speedMultiplier: 300.
• Enable dual-rotor status tracking via hasRearTach: true.

Test Plan

1. Syntax Validation: Validated JSON syntax using JSONLint.
2. Formatting: Pretty-printed configurations using the jq command for readability.
3. Build & Config Tests: Compilation and configuration validation tests passed successfully.
4. Service Verification: Confirmed that the following services start and run without errors:
   • platform_manager/platform_hw_test/platform_manager_hw_test
   • sensor_service/sensor_service_client/sensor_service_sw_test/sensor_service_hw_test

Attachments:
icecube_2026_07_14_test_log.zip