Use the prefix for fio result keyval

BUG=None
TEST=Run platform_CryptohomeFio.dirty_setting,
Check keyvals are correct.

Change-Id: I18a91d038f519938b069fbb672c6b17c7367acf2
Reviewed-on: https://chromium-review.googlesource.com/203636
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Commit-Queue: Gwendal Grignou <gwendal@chromium.org>
Tested-by: Gwendal Grignou <gwendal@chromium.org>
1 file changed