vell: Lower host shutdown percentage to 3%
Regarding to b/215338892 to lower host shutdown percentage to 3%
BRANCH=none
TEST=Pass battery RTC battery life on S5.
#define CONFIG_KEYBOARD_FACTORY_TEST
#define CONFIG_KEYBOARD_REFRESH_ROW3
+#undef CONFIG_BATT_HOST_SHUTDOWN_PERCENTAGE
+#define CONFIG_BATT_HOST_SHUTDOWN_PERCENTAGE 3
+
/*
* Older boards have a different ADC assignment.
*/
