link: Add charge_near_full state

Tell the host the battery is no longer charging when it hits 97%, and
set the power adapter LED to green.

This solves several problems:

1) The last 3% of charge takes a looong time.  Kernel/ACPI/UI already
have a hack to show the battery as charged when it's about 3% from
full, but the EC still showed a yellow LED.

2) If the system is charged and you briefly unplug the adapter, the
LED turned yellow for a long time as it slowly trickle-charged.  Now
it goes right to green.

3) A fully-charged battery will drop below 100% charge as it settles,
but won't accept more current at that time.  This caused the LED to
turn yellow and stay there until the battery finally settled down to
~96%, at which point it'd accept more current and top itself off.  The
whole time it did this, the kernel/ACPI/UI hack from (1) would keep
reporting "battery full".  Now the LED stays green too.

BUG=chrome-os-partner:11248
BRANCH=link
TEST=manual

- Discharge system to <95% full.
- Plug adapter in.  LED should come on yellow.
- At around 97% full, the LED should turn green.
- Around that the UI will display "battery full".
  (Note that due to rounding, the UI may take a few minutes to display
   "battery full" after the LED goes green; that's ok)
- Unplug and replug adapter.  LED should come on green.  UI still reports
  "battery full".

Change-Id: Ie56fbf3a05239e73d2c765bb98d36aa5cfedc2ef
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/34452

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