Kevin: enable CONFIG_CHARGER_DISCHARGE_ON_AC
This enables CONFIG_CHARGER_DISCHARGE_ON_AC so the
ectool chargecontrol discharge command will work.
BRANCH=none
TEST=run 'ectool chargecontrol discharge'
#define CONFIG_CHARGER_BD99956
#define CONFIG_CHARGER_INPUT_CURRENT 512
#define CONFIG_CHARGER_MAINTAIN_VBAT
+#define CONFIG_CHARGER_DISCHARGE_ON_AC
#define CONFIG_CHARGER_V2
#define CONFIG_CHARGER_MIN_BAT_PCT_FOR_POWER_ON 2
#define CONFIG_CHARGER_LIMIT_POWER_THRESH_BAT_PCT 2
