crosperf: Disable turbo only if enabled.

Write to no_turbo file only if the field is set to 0.
BUG=chromium:839125
TEST=No more errors

Change-Id: If5de67606557c21107843837afd035cf32545475
Reviewed-on: https://chromium-review.googlesource.com/1042866
Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Caroline Tice <cmtice@chromium.org>
2 files changed