Hibernate when in G3 for 24 hours
Hibernate when in G3 for 24 hours

To save power, make the EC hibernate after we go into G3 for 24 hours.

BUG=chrome-os-partner:9386
TEST=Use "hibdelay 5" to change the delay to 5 seconds.
     Remove AC power, power down and check device hibernates after 5
     seconds in G3.
     Connect AC power, power down, wait for G3. Remove AC power and
     check device hibernates after 5 seconds.

Change-Id: I6fb907c904798076a763f22bd35f53f7424d6200
Reviewed-on: https://gerrit.chromium.org/gerrit/29400
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>
Commit-Ready: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Tested-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>

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