INA226: Integrate with PX4 (#12673)

* Publish I2C battery data as battery_status

src/lib/battery/battery.cpp

@@ -98,6 +98,11 @@ Battery::Battery(int index, ModuleParams *parent) :
 	updateParams();
 }
 
+Battery::~Battery()
+{
+	orb_unadvertise(_orb_advert);
+}
+
 void
 Battery::reset()
 {

src/lib/battery/battery.h

@@ -65,6 +65,8 @@ class Battery : public ModuleParams
 public:
 	Battery(int index, ModuleParams *parent);
 
+	~Battery();
+
 	/**
 	 * Reset all battery stats and report invalid/nothing.
 	 */