[FL-1268] Gauge re-calibration (#471)

* bq27220: add new battery profile parameters
* bq27220: add gauging configuration
* power: change poweroff condition depending on remain capacity
* api-hal-power: update api for f6 target

applications/power/power.c

@@ -206,7 +206,7 @@ int32_t power_task(void* p) {
                 model->temperature_gauge =
                     api_hal_power_get_battery_temperature(ApiHalPowerICFuelGauge);
 
-                if(model->voltage_gauge < 3.3f && model->voltage_vbus < 4.0f) {
+                if(model->charge == 0 && model->voltage_vbus < 4.0f) {
                     battery_low = true;
                 }