casta:Turn on green led when charge state is idle
casta:Turn on green led when charge state is idle

Battery led is green when charging is stopped,
AC is connected and system is S5.

BUG=b:130334341
TEST=Build & flash EC then check battery led.

Change-Id: Ib31a94ba5ad9a7e78cc87a3bf1980638ae9599c3
Signed-off-by: YongBeum Ha <0375183cfb575c7cdd5cfe73f9fcd260a8810df7@samsung.com>
Reviewed-on: https://chromium-review.googlesource.com/1563873
Commit-Ready: ChromeOS CL Exonerator Bot <fa429e5907f00867f797423aea74327bb02c91b6@appspot.gserviceaccount.com>
Reviewed-by: Jett Rink <9d4aef0593e6843318d99df31597fb6153b89787@chromium.org>

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