[Celestica] Icecube: Config: Abstract CPU I2C bus name to CPU_BUS@0 in platform_manager

[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

Abstract the legacy CPU I2C adapter bus definition in icecube's platform_manager.json to align with the unified CPU bus naming convention.

Mainly change as follows:

• Abstract the hardcoded I2C bus name SMBus I801 adapter at 5000 to the standardized virtual bus CPU_BUS@0.
• Update the idpromConfig entry under MCB_SLOT to use CPU_BUS@0.
• Align i2cAdaptersFromCpu declaration list with CPU_BUS@0.

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. Dual-Kernel Service Verification: Confirmed backward/forward kernel compatibility by verifying that the full platform test suite runs without errors across both Kernel 6.11.1 and Kernel 6.16.1 target hardware environments:
   • platform_manager/platform_hw_test/platform_manager_hw_test
   • sensor_service/sensor_service_client/sensor_service_sw_test/sensor_service_hw_test

Attachments:

icecube_test_log_2026_7_27.zip