Ladakh800bcls: Platform: Prevent i2c timing issues

[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

This PR is to preload the i2c kmod to prevent the related i2c timing issues.

The fboss_iob_i2c kmod is added to requiredKmodsToLoad which can avoid the conflict of creating i2c bus.

For reference

1. PR: #719
2. Post: Delay in creating iob_i2c_master bus.

Test Plan

platform_manager.log