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ARCVM already does this with SchedulerConfigurationManager's
observer, and this is Crostini port of the feature.

BUG=1011559
TEST=try, lscpu in guest returns 2 on eve

Change-Id: Ie94497ed803c2e10f17def26855107e0f1c336e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1972883Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726226}