clang-tidy: enable clang-tidy

Enable the first check: readability-identifier-naming

Also fixed all check failures.

Tested:
1. compiles, no clang-tidy failures
2. the two daemons work correctly on

clang-tidy: enable clang-tidy

Enable the first check: readability-identifier-naming

Also fixed all check failures.

Tested:
1. compiles, no clang-tidy failures
2. the two daemons work correctly on hardware regarding DBus APIs

Signed-off-by: Nan Zhou <nanzhoumails@gmail.com>
Change-Id: Ic415e857726e8f521c1d61a3e7f0c85121c0d284

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