Add a 'power_state' control to board daisy, spring and peach_pit

BUG=chromium:326738
TEST=tested all power_state settings against daisy and spring.
peach_pit will be verified after the build is staged in lab.

Change-Id: I9a524dd94a2f5a2efc00a8168237e013e3835fe4
Reviewed-on: https://chromium-review.googlesource.com/188182
Reviewed-by: Dan Shi <dshi@chromium.org>
Commit-Queue: Dan Shi <dshi@chromium.org>
Tested-by: Dan Shi <dshi@chromium.org>
5 files changed