[Accton][wedge800cact] Add fw_util.json

[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
• pre-commit run

Summary

Added fwConfigs entries for bios, iob_fpga, dom_fpga, mcb_cpld, smb_cpld, and scm_cpld. Verified the new configuration on a wedge800cact device.

Test Plan

1. Print firmware version prior to performing the downgrade.
2. Perform firmware downgrade.
3. Power-cycle the system and verify that the downgraded firmware version is correctly applied.
4. Perform firmware upgrade.
5. Power-cycle the system and verify that the upgraded firmware version is correctly applied.
6. Perform a downgrade followed by an upgrade.
7. Power-cycle the system again and confirm that the final firmware version matches the expected version.

Test Commands

1. Get Version : fw_util --config_file=./fw_util.json --fw_action=version --fw_target_name=bios
2. Backup(Old) : fw_util --config_file=./fw_util.json --fw_action=read --fw_target_name=bios --fw_binary_file=./bak/bios_NL404.bak
3. Update New : fw_util --config_file=./fw_util.json --fw_action=program --fw_target_name=bios --fw_binary_file=./new/NL405.bin
4. Verify New : fw_util --config_file=./fw_util.json --fw_action=verify --fw_target_name=bios --fw_binary_file=./new/NL405.bin
5. Update Old : fw_util --config_file=./fw_util.json --fw_action=program --fw_target_name=bios --fw_binary_file=./bak/bios_NL404.bak
6. Verify Old : fw_util --config_file=./fw_util.json --fw_action=verify --fw_target_name=bios --fw_binary_file=./bak/bios_NL404.bak

Test Log:
w800c_fw_util_20251201.txt
w800c_fw_util_hw_test_20251201.txt