kernel will get the battery info through command "ectool battery",
so we need to get the remaining capacity dynamic.
BUG=b:65494883
BRANCH=none
TEST=run "ectool battery" in kernel, and get the battery info.
Change-Id: Idf824f6dc1e72acd17156c03d81c0ca87adc109f
Signed-off-by: Lin Huang <hl@rock-chips.com>
Reviewed-on: https://chromium-review.googlesource.com/658160
Reviewed-by: Philip Chen <philipchen@chromium.org>