spring: Prevent showing green LED when we are actually charging
spring: Prevent showing green LED when we are actually charging

When we use about the same amount of power as what the charger provides,
we sometimes show green LED. We should avoid this when the battery is
not full.

BUG=chrome-os-partner:19746
TEST=Manual
BRANCH=spring

Change-Id: Id31762aefe22535de64f63a023c35995a3725ef8
Signed-off-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/56724
Reviewed-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>

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