refactor cpu_data_collector to add the code to parse new cpu freq system file.
refactor cpu_data_collector to add the code to parse new cpu freq system file.

I'll add the code to parse new file/format in follow up CL as I don't have the machine to verify. This at least eliminate the unnecessary log message.

BUG=548510
TEST=tested on the pixel 1.

Review URL: https://codereview.chromium.org/1493563002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#362855}

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