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This change adds a cpu_max_clock_speed_khz field to SystemInfo and a
scaling_current_frequency_khz to CpuUsage.

Bug: 1128204
Change-Id: I1773748f1fc307564e2a98d7504f3823e1e08c75
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532765
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Auto-Submit: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830838}