Change ports hyperthreading reporting to kvmtool from qemu

It improves speed of kernel compile from 8min to 6min:30sec.

Change-Id: I917d7aa1de29f55b4494639bbefaba7a73b517cc
BUG=None
TEST=kernel compile in VM on hyperthreaded x86 notebook
Reviewed-on: https://chromium-review.googlesource.com/439386
Commit-Ready: Slava Malyugin <slavamn@chromium.org>
Tested-by: Slava Malyugin <slavamn@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>
1 file changed