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

applications/power/power.h

@@ -1,3 +1,19 @@
 #pragma once
 
 typedef struct Power Power;
+
+typedef enum {
+    PowerBootModeNormal,
+    PowerBootModeDfu,
+} PowerBootMode;
+
+/** Power off device
+ * @param power - Power instance
+ */
+void power_off(Power* power);
+
+/** Reset device
+ * @param power - Power instance
+ * @param mode - PowerBootMode
+ */
+void power_reset(Power* power, PowerBootMode mode);