Electro: Fix power lost when release shipping mode
Electro: Fix power lost when release shipping mode

Battery need some time to provide power when releases
shipping mode or plug in battery at first time.

BUG=chrome-os-partner:60921, 59904
BRANCH=master
TEST=remove battery & AC, then insert battery & AC,
system can boot up.

Change-Id: I33ca4df54e0b02e68ade9426864561dae8c57851
Signed-off-by: Ryan Zhang <50a92783d595cae957ab2a2aa8dfe1aa1d9433fd@quantatw.com>
Reviewed-on: https://chromium-review.googlesource.com/419881
Commit-Ready: Aaron Durbin <af0622ab041e8b0f8e5819838dcc93898196e71f@chromium.org>
Tested-by: Aaron Durbin <af0622ab041e8b0f8e5819838dcc93898196e71f@chromium.org>
Reviewed-by: Aaron Durbin <af0622ab041e8b0f8e5819838dcc93898196e71f@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec