vboot_reference: Fix keyboard input lag at confirm screen.

Changing languages is terribly slow at the confirm screen, when
switching from dev to normal. Reduce sleep time to improve user

TEST=boot in dev, hit space, hit arrows rapidly to change language,
observe no lag.
BRANCH=butterfly, stout

Change-Id: I0943debc31d78dcfce87e7f7d4537ae47f5f8cfd
Reviewed-on: https://gerrit.chromium.org/gerrit/36956
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Commit-Ready: Shawn Nematbakhsh <shawnn@google.com>
Tested-by: Shawn Nematbakhsh <shawnn@google.com>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/37938
Tested-by: Simon Glass <sjg@chromium.org>
1 file changed