Liara: Update LED behavior
Liara: Update LED behavior

There is no power status indicator LED in customer UX spec,
so LED only shows the charging status.

The LEDs status defined as below a lookup table.

Charging        Amber on
Full Charged    White on
Discharging     Off
Error           Amber, 250 ms on / 250 ms off

BUG=b:116081524
BRANCH=none
TEST=manual
1. Check charge led Amber on when battery is charging.
2. Check charge led White on when battery is full.
3. Check charge led is off when battery is discharge.
4. Check charge led amber on 250ms off 250ms when battery off.

Change-Id: Id3e1741b5cc88014ce169cb44229072c80e1bcc4
Signed-off-by: Josh Tsai <b681810fc49463e1e4e60070acf67ed415b3510c@compal.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/1285929
Reviewed-by: Jonathan Brandmeyer <fec1f53cb6eb4426eb62f1a1e49909eafbea899c@chromium.org>
Reviewed-by: Raymond Chou <fb67868b0c2372238970ba703383f48879b7e0a1@compal.corp-partner.google.com>
Reviewed-by: Ruby Lee <94fbd383954e4ee83e9dd4a7e52a835d105a3114@compal.corp-partner.google.com>

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