[clang-tidy] Fix clang-tidy errors and format code

Fix the following readability-* errors:
readability-avoid-const-params-in-decls
readability-redundant-string-init

More details in b/375055000

Also run openbmc_build_scripts/scripts/format_code.sh to pass presubmit.

Change-Id: Ia5ee9ba75025ed259ed99d624c0e5ccb9aca7058
Signed-off-by: David Tang <davtang@google.com>