[Celestica] Ladakh800bcls: Bsp: Add mdio bsp tests

[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

shellcheck...........................................(no files to check)Skipped
shfmt................................................(no files to check)Skipped
trim trailing whitespace.................................................Passed
fix end of files.........................................................Passed
check yaml...........................................(no files to check)Skipped
check json...............................................................Passed
check for merge conflicts................................................Passed
ruff check...........................................(no files to check)Skipped
ruff format..........................................(no files to check)Skipped
Prevent sai_impl in fboss manifest.......................................Passed

Summary

To verify the MDIO function of BSP, need add related tests.

1. MdioTest.CreateMdioBus: Verifies the ability to add and delete an MDIO bus.
2. MdioTest.MdioBusReadAndWrite: Verifies read and write operations. The test MDIO bus and related registers are configured via bsp_tests.json.

Test Plan

[root@localhost fboss]# LD_LIBRARY_PATH=./lib/ ./bin/bsp_tests  --bsp_tests_config_file ./config/bsp_tests.json --gtest_filter=MdioTest.* 2>&1 | tee -a "logs/bsp_tests.log" &
[1] 151024
[root@localhost fboss]# Note: Google Test filter = MdioTest.*
[==========] Running 2 tests from 1 test suite.
[----------] Global test environment set-up.
I0509 17:29:29.720261 151023 PlatformNameLib.cpp:84] Platform name read from cache: LADAKH800BCLS
I0509 17:29:29.720365 151023 BspTestEnvironment.cpp:32] Platform: LADAKH800BCLS
I0509 17:29:29.720799 151023 PlatformNameLib.cpp:84] Platform name read from cache: LADAKH800BCLS
[----------] 2 tests from MdioTest
[ RUN      ] MdioTest.CreateMdioBus
[       OK ] MdioTest.CreateMdioBus (2487 ms)
[ RUN      ] MdioTest.MdioBusReadAndWrite
[       OK ] MdioTest.MdioBusReadAndWrite (5714 ms)
[----------] 2 tests from MdioTest (8202 ms total)

[----------] Global test environment tear-down
[==========] 2 tests from 1 test suite ran. (18072 ms total)
[  PASSED  ] 2 tests.

When adding --logging=DBG4, details can be found in the log below.
bsp_tests.log

[meta-codesync]

@mikechoifb has imported this pull request. If you are a Meta employee, you can view this in D105336351.