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This adds CPU Frequency stats to ARC++ tracing tool.

TEST=Locally, unit_tests
BUG=b:141635977

Change-Id: Ib2645579d4d1be837f37ecacfd20364559768f7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1825823
Commit-Queue: Yury Khmel <khmel@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700016}