Api-hal-power: reset routine. Power: safe to poweroff message, cleanup. (#436)

firmware/targets/f5/api-hal/api-hal-power.c

@@ -48,7 +48,7 @@ const ParamCEDV cedv = {
 
 void HAL_RCC_CSSCallback(void) {
     // TODO: notify user about issue with HSE
-    NVIC_SystemReset();
+    api_hal_power_reset();
 }
 
 void api_hal_power_init() {
@@ -150,6 +150,10 @@ void api_hal_power_off() {
     bq25896_poweroff();
 }
 
+void api_hal_power_reset() {
+    NVIC_SystemReset();
+}
+
 void api_hal_power_enable_otg() {
     bq25896_enable_otg();
 }