purge linux/cpumask.h usage

We've hardcoded these values to "one cpu", so just inline it in the
single place that uses it.

BUG=chromium:878440
TEST=build works

Change-Id: I5f7ba3b3c732fce2273ea532ed8c1f3c4c646e22
Reviewed-on: https://chromium-review.googlesource.com/1194716
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
4 files changed