Sort CPU frequencies before picking the highest one.

We need to sort the available frequencies before selecting
the highest one. The frequency list order changes from
board to board

BUG=chromium:564887
TEST=Verified by hand and on Jaq machine

Change-Id: Ief9ca216489fcf84b4c34688309b89be07d52c1c
Reviewed-on: https://chrome-internal-review.googlesource.com/240946
Commit-Ready: Luis Lozano <llozano@chromium.org>
Tested-by: Luis Lozano <llozano@chromium.org>
Reviewed-by: Yunlian Jiang <yunlian@google.com>
Reviewed-by: Luis Lozano <llozano@chromium.org>
1 file changed