Charging Led blinking only allowed when battery SoC between
15% to 90% and HVDCP charger inserted.
Change-Id: I5b601b3487164c46e80bc309b2938dd025754734
Few APIs are provided in the libhealthd library as the supplement of
off-mode charging, it includes:
1) Draw battery status on the animation;
2) Update leds upon battery status change;
3) Handle charging disabled;
Change-Id: Ifa42ccec70e4f3e7b20fda5ce3f33dc41252a440